1) not a loose raise, although i see the dead ones are bad for you
2) yeah 4th 5th and 6th are folds imo
on 4th you bricked out and its a pretty small pot so pot odds not on your side, so just fold
on 5th you caught good but he caught better. the bet doubled. fold.
on 6th you are looking at 4 cards which can beat your low and while you have a low, it's not good enough, so what draw do you have? you can't draw to beat his low, you can only tie at best. you might outdraw his low if he only has a 7, but you have very few outs for that. you also have no real high hand which lets you escape. OK, so AQ high winning for the high side is a thing sometimes, but not against 4 to a 6 with an ace showing. and yes, you have an open ender. but like i said, 6543A probably isn't going to be enough, and if you're going for the the 8 high straight, well, you're drawing to only maybe get half the pot.
all this inside a relatively small pot. i like folding