Road Bike/ Retul fit newbie question

Hi,

Hoping for a bit of help…

I bought my first road bike in April of this year. This in the one, http://www.evanscycles.com/products/specialized/secteur-x3-2014-road-bike-ec053051

I have steadily been increasing my rides since I bought it and cycle about 13 miles 2-3 times per week I noticed a niggle shortly in to starting above my right knee. I raised the seat a couple times which improved it but did not get rid of it completely. In the past week I decided to try and get it sorted once and for all. I booked a physio appointment and booked in a for a retul bike fit.

My question is on the back of the bike fit. My seat has been moved forward and a few other adjustments made. I am needing to get a 140mm stem for the bike and the person doing the fit said I could actually do with a 150mm stem! The bike I have has a sloped top tube seemingly bikes with out this would be slightly longer so I would not need as long a stem.

I am 6 foot, and have 31/32 inside leg…fairly average. I guess what I’m asking is, does this seem right? I’m surprised the bike is basically slightly to small for me

It’s a 56cm frame.

Any help would be appreciated.

Thanks

Chris