I don't know why you want to add dark extract and chocolate malt, but that's a personal choice I guess. 1 1/2 lb. of crystal is a bad idea in extract beer. There are plenty of unfermentables in there already. You'll need to do a minimash for the wheat malt and flaked wheat. The wheat may may have enough distatic power to convert the flakes, but if it was me I'd add at least .5 lb. of pale malt to be safe.
So if I sub the dark malt with pale malt that would still get a "amber color" and then decrease the crystal malt does that sound better? Would you add anything else?