Have you posted on the bottle feeding forum about which bottles/teats you're using? Sometimes he might need a faster or slower flow teat to be able to feed more effectively, but I'm afraid I bf so no experience with bottles. Another thing to consider if he's taking a long time to feed would be something like a tongue tie - I don't know if anyone's checked him for that? Some babies do like to feed little and often which might be a sign of reflux - anything ring a bell?
Reflux 101 - General reflux informationOtherwise, the best way of encouraging full feeds is to make sure they are spaced an appropriate time apart so that he is hungry enough to take a good feed. Avoiding feeding when he is really tired/sleepy (so falls asleep) can also help as he is awake enough to feed properly
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With the naps - if it's working for you, then that's fine
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Just make sure he gets enough feeds in the day z(typically 5 daytime feeds and a dream feed, +/- NFs) so he's not missing out on calories by being asleep.