the minuses should all be corrected with time and proper technique! you can get in and out easier by wearing slimmer, less bulky shoes and also by not switching shoes around so much when you ride. i try to always ride with the same shoes, that way i dont keep having to adjust the straps tighter and looser. if you feel like you are about to pull out you might have clips that are too small, not allowing your foot to stand properly on the pedal. also, your straps might not be tight enough. as far as the power transfer, that is something that can be corrected with A-running straps and clips of proper size and tightness, and by B-getting used to the "feel" of the ride and also perhaps improving your pedaling technique. the reason it feels less powerful is because you are using your legs more now and there is a larger degree of precision needed --- whereas the safety net of those clip-in shoes made it too easy on yourself.

stick with the clips and straps for another week! guaranteed convert!