Low saddle but comfy...should I aim high?

I found this absolutely perfect for me:

https://www.competitivecyclist.com/Store/catalog/fitCalculatorBike.jsp

You need to take detailed measurements of yourself, a friend/relative is helpful, then input the figures and you get three basic fits out. Give it a try!

To look at, my saddle looks a bit low too, about 70mm above the bars, but I can spin up to 35kmh on flat bits of my commute and cycle 120 miles without knee/back pain, so I'm sticking with it.

@mateus - Here is a link to GCN (Global Cycling Network) short video on 'How To Set Your Saddle Height' with great and easy how to explanations. It's well worth a see.

https://www.globalcyclingnetwork.com/video/how-to-set-your-saddle-height...

And, baseline plastic goniometers are fairly inexpensice on eBay, that is, if you're considering a DIY fit.

There are many formulas for calculating saddle height but they are all just guides to a starting point, some giving higher and others giving lower heights. From there you need to find what works for you, and it seems you've found it. For myself I need to set my saddle towards the higher end of the scale or I suffer from knee pain in the same area as you. For me 5mm makes all the difference. My experience makes me think that a slightly lower saddle favours higher cadences.  

What’s to say that your friend’s saddle is not too high? Adjusting your position relative to someone else is not a good idea. How does yours compare with the majority of experienced riders? As others have said, comfortable does not mean correct. Do you ride with your heel up, level or down, foot forward or back on the pedal, saddle forward or back? All these can make a significant difference to saddle height so either a professional bike fit or experiment with small changes and allow time for them to feel right before seeing if the change is an improvement or not

You should have 30-40 degree bend in the knee when the crank is in line with the seat tube, with your foot in the same position it would be during that part of the pedal stroke. Where you sit in that range will be dictated by how much flexibility you have in your leg muscles and how aggressive your riding is. 

In terms of fore and aft movement you want the knee- not the kneecap, the sticking out but just underneath- to line up with the pedal axle when the pedal is horizontal. It’s not always possible depending on leg proportion but that’s the goal and will work for most people. Adjust height, then fore/aft before checking the height is still okay based on the other adjustment.

And just for reference, a large percentage of people run their saddles to high, particularly old school riders so looking at everyone else- especially if they have not been fitted is not helpful.

Personally, I'd be wary of going higher if it's comfy now. When i got my Giant I set t he seat quite high so it felt super-efficient pedalling but still no hip rocking. It felt superb but I ended up dealing with ITB syndrome for 9 months which was really unpleasant. I lowered the saddle 15 mm so it felt like the rest of my bikes and I've been fine since.  What I'm basically saying is that yes, there is an optimal seat height for efficiency but that position won't necessarily agree with your knees!

It depends what you're after. You're going to acheive 95% of possible performance in just about any position that is comfortable, however most positions beocme comfortable as a result of adaptation, so a new, better position could well start off uncomfortable, but become comfortable. 

Personally I'd suggest a decent bike fitter, and persist with their recommendations for a number of easy rides (3-6 weeks). Front of knee pain is 'treatable' by a number of changes including cleat position, saddle for and aft and saddle angle.

It depends on if your current position may cause pain in the long term. Generally if it’s comfortable, it shouldn’t. Myself, I don’t race and I don’t ride more than 3 times per week (don’t we wish we didn’t have to work!) so I did a fair bit of research and through all the theories and rules of thumb, came up with a position that I’m comfortable in. I’m sure if I paid somebody $500 and another $500-$700 on replacement parts and shoes, they could change my position a few mm. But I say if it’s not hurting and you don’t have underlying injuries, go with what’s comfy. Oh and btw, I’m not knocking bike fitters, I just don’t think it’s worth the money for people who don’t have injuries or pain and don’t race. 

Check your saddle fore/aft. That's the usual issue for front of knee pain.

Normally, the most comfortable position is the best.