Remember that SHFFL aerials aren't your only option. If they're not dealing with the lasers well at all, approach with them, ending probably with a laser shine. Since shine starts like every combo in existence, you're in a great position. If the shine hits a shield, either JC grab out of shine or go for some safe shine nair pressure.
If you're dedicated to SHFFLing, you can do nair a little bit earlier, be sure to get your L-Cancel, and maybe move a bit so you can land a shine or utilt after that. Alternately, you could do a SHFFL late dair shine, which is a technique I'm currently working on. It's a lot of stylistic preference, but basically remember that you have plenty of options.
Heck, if you want to wall them out with lasers and wait for them to make a crappy decision as an approach and punish that, just go with what works.