i feel you man! anyway in that case i think getting down jc grab perfectly should be your top priority during training. try some dash -> shield stop -> a (basically shieldgrab out of a dash), i guess it is just as fast as jc grab if executed perfectly (possibly faster?), just do not press l+a at the exact same time or you'll get a running grab. remember you can also aerial straight into a grab (nair grab is a thing at low %s, drill grab almost always, also grab if you hit a shield), jab grab (maybe jab -> shield -> a if you can't really jc the jab), tomahawk grab, cross up with an aerial or even empty full jump (vs peach, puff, ics, samus, just mix up with full jump cross up bairs if they grow bold, works like a charm) -> turn around grab; walk up grab (!!!) really isn't a thing in neutral but you'll see colbol do it many times against a falco that's been popped in the air already by some random stuff (utilt, dtilt, dash attack) and isn't going really far. just use your focus for figuring out a creative way on how to get the grab, and it'll be easy piece from there since it's just a matter of upairing / utilting / usmashing. when pressured turn your back to the opponent and put up a wall with things you'll hardly flub: utilts, spaced bairs, wd back ftilt, more utilts. also possibly look at your surroundings: evading to the top plat is always an option under pressure, just do not stand still once up there. once the pressure is off of you, techskills will be back as well!