Where to compromise? Standover height or weight balance?
I'm trying to pick a frame/size for a cx bike I want to build. I've built a couple of bikes recently and I know my fit very well, but I'm a difficult fit because I have a VERY long torso and very short legs. I need a effective TT of around 565mm to 580mm, or better, a frame with a REACH of about 390-395mm.
Let me say first that I *completely* understand that "standover height" is NOT a way to fit a bike. I'm not even considering fitting with standover. But there is the issue of whether or not one can actually stand over the bike. That said, here's the compromise I'm facing.
I'm looking at the FlyX FR-602 CX disc frame. In the size 56, the reach is going to be too short unless I go with a size 120mm stem. Even there it's close. My worry with the 120mm (or 130) stem is not that stems that size are too long in general, but that they are too long for me. I have a long torso AND very short arms, so with a stem longer than 110 I find my balance is too far to the front of the bike. I have short legs with short femurs, so with my saddle position and my very long torso, extending myself out further in front of the head tube means getting a lot of weight very far forward...
In size 58, the reach on the frame is just about perfect, and I can run a 110 stem and get all my stack and reach numbers correct. However, from what I can calculate, the standover height will be right at 32". My Soma Smoothie (in size 58) has a published standover of 31.7", but when I measure it it's a little under that. At 32" I can stand over the bike, but I am pretty much sitting on the top tube.
So which way would you all go: get the smaller frame with a longer stem, and not worry about the balance being too far forward; or get the larger frame and not worry about standover?
(Note: I'm also open to another open-mold carbon frame with a sloped top tube, but I've done a ton of looking and haven't found any out there...I"m partial to the Flyx 602 because I have a FlyX FR-315 that I LOVE...)