Platypus Never noticed flat bottom brewers being more forgiving (or any brewer for that matter - you always need grind setting, dose, brew water weight & pour rate). More body in the cup likely comes from the shallower bed and increased agitation compared to a V, or truncated cone - more particulate matter getting into the cup. I try and keep the body similar across brewers.
Better heat retention can’t hurt, I have a 1L Pyrex jug that holds most 1-2 cup brewers, I preheat with 100-200g of boiling water and let it sit whilst grinding. Drain brew water & place on brew stand/cup/carafe & dose coffee as your brew water hits boil.
Bear in mind that heat is predominantly lost through the open top of the brewer, nice to have it ‘cool to touch’ at end of brew though…in fact, probably necessary as it has no handle.
I have no interest in smushing, I guess it’s handy if you can mangle a Melitta paper in there if Wave papers run out? Ozone usually have good stock of Kalita papers, but there can be short periods of no stock.