You could always just run at them and shine > JC USmash/Grab. No movement tricks or anything. Just blast straight at them. Not too often though, just like...once a fight. A nice little trick since you'll keep some of the momentum from your dash if you do it fast enough and the JC will let you hit/grab most characters with that momentum.
Other than that, waveshining any time you use the shine is a must, even if you just WD in place to cancel the shine lag.
I don't think you should be waveshining yet if you can't shffl though. I would definitely get that down first. SHFFLing on opponents and off opponents so you can make sure you get the timing right both ways. Once you get SHFFLing down, start SHFFLing into a waveshine. If you can waveshine out of a SHFFL, you can pretty much waveshine whenever.