i agree with kupo on the issue of brawl+ scaling. this is a problem inherited from brawl, actually.
in brawl, you see people living to absurd percents, and, while their momentum-altering techniques do lend to this, it's a feature that shouldn't be so present in smash. the window for things to happen in brawl is way too huge and, thus, very slow in tempo. the 'good news' for brawl is that it didn't have to worry about hitstun and the like, which brings another question to the table: window for opportunity.
b+ is crippled by this huge window of opportunity further than brawl is. the place for which early combos and midpercent combos is huge because of it. if you think of it in metaphorical terms, 64 was extremely comfortable, somewhat compact which isn't a bad thing, and people could relax anywhere; if you wanted a bedroom, 64 was where it was at. melee is like the living room, though, also compact but room for more than 64. you've got a few really soft lounge chairs, and you've got a nice couch too. there's an entertainment system and stereo setup there if you really want to make it more involved, but you could relax when you wanted to (just not while everyone was partying).
then there's brawl+'s area: the den. great like the living room, but it's too big and is about appreciating smash and the greatness of previous titles (thus the hugeness from brawl). it's not a place for booming tunes. there's lots of potential, but the size of the place makes it lose that comfortably personal style. place needs to get smaller.
basically, brawl+ Knockback scaling needs to be trimmed down to make the combo system more compact and allow kills at a reasonable percent rather than a brawl percent. closer to 64, man. even if death boundaries have to be made bigger or something to compensate (like in 64 and melee? where at a huge percent you blasted off forever).