agree with the comments for a longer stem. it is counter-intuitive, but trust me, being cramped is extremely uncomfortable.

your neck will probably complain a bit, and you'll feel it in your back and glutes a lot more than mountainbiking at first. I would go ahead and get a fit, and pay attention to what the fitter is doing. you will gain flexibility and comfort with the road position and you'll most likely end up lower and longer than the fitter sets up for you right now.

but you can then make those future changes on your own.