What's 'right' is what feels best for 'you'. Funny thing is that now that I've adapted to feeling very comfortable playing the smaller feather light Yammy keys, my Steinway Grand's keys (weighing in at the other key weight/size extreme), has become the more difficult for me to play recently.

Even between the different makes and models of acoustic pianos, key feel, weight and size may vary significantly. Before the portable elec keyboards revolution, pro pianists were routinely faced with the challenge of performing on pianos of widely varying keyboard action & feel. This included pianos 'out of regulation' (some keys easier to press than others), or with missing strings. The advantage we have as portable electronic keyboard musicians is not only that elec kbs don't need to be tuned, but that its feel (action) remains "consistant" from the lowest to the highest note, which is often not the case with older (out of regulation) acoustic pianos.

Granted, it took a while for me to adapt my keyboard playing style to synth action boards, but I now feel pretty comfortable adapting back and forth between the Steinway's heavyily weighted & significantly larger keys to the feather light smaller Yamaha PSR keys. I've now developed the confidence to play (without too much trepidation), other keyboards out there whose key action, size/weight probably rests between these 2 extremes. Developing the ability to adapt has become the key here.

Scott