Just a couple of thoughts. I use the LeMond-Guimard method of frame sizing. Basically .665 X inseam in CM and it gets me in the ball park. Before I got old and then broke my neck and had C1 & C2 I was also 5'10". My inseam is 32.5" With your unusually long inseam I'm guessing you could ride a 60-62 frame. (I should note that I measure frame size using a virtual TT rather than the sloping TT.) I'm also guessing that you have a short reach and would need a shorter stem. As for saddle height. I don't measure from the BB. That can give you a false reading since crank length varies. I've checked that with people who do professional bike fits and they agree with me. Better to measure from top of saddle to pedal spindle.