I think you have answered your own question

There is nothing wrong with giving Lukey cuddles and extra treats etc ... but if you feel that is making him more difficult to manage then, for now, I would stop with all the extra fuss and see whether that makes a difference.
I tend to try to get my dogs to do something (anything - it could be a sit, down, quick stay etc) before they get a treat or a fuss. Then they are earning it, if you see what I mean.
Other people may feel differently, but I don't really agree with the whole "dominance" theories. If a dog were lying across a doorway, I would just step over him; if he were to go through a doorway in front of me - no bother; and I don't eat before my dogs etc.
Dogs in general need leadership, and so long as you have boundaries (and stick to them

) and are consistent, then you shouldn't go far wrong.
Try making Lukey do something before he gets his treats or his fuss - and then he will feel he has earned them