Thanks, now I can look at it to see the specifics of the setup. I guess it doesn't work midscreen?
The first thing to keep in mind is just to avoid getting cursed as much as possible. Make active efforts to avoid the clouds and wayward bugs. Once cursed, (NOT your go to strategy) try to poke him out BUT ONLY the instant you get cursed before there are any bugs on screen, after that, just try your best to block till it's over. His best damage is off an overhead, just so you know.
As for offensive, once on him, stay in him. Use 5A to make sure he stays put after a combo/knockdown.
A lot of arakunes like to think that their 5A is the best DP in the game so look out for wakeup mashing. Another thing they like to do is back/ front dash out of your range, since it's invuln on startup, if they're in the corner, give them 5B length of space in case they try to pull a mash 5A or front dash out.
I find there's nothing much you can do about air to air, since he has j.4/5B and j.6X (unless you're SUPER comfortable with the timing on j.D), so nails are good for getting/closing some space and to keep him on the ground when need be.
Maybe I covered everything, prob not. Ask if I missed anything specific.