To the OP
@Slepperev ...I would still check to make sure the screw on the bottom of the atty is sticking out far enough to use safely on a hybrid, I would check every trap screw on your build of your atty and every insulator of everything on that mod...just because it stopped arcing by spacing out the contacts doesn't mean that there isn't a problem hidden in the wood works. I would check everything again after that just to be on the safe side.
The only atty I ever had hard short and fuse on me was an authentic JD Tech Manta V2 atty on a Authentic JD tech Stingray using a authentic JD Tech hybrid cap...and that's the way they advertised the setup to be used and it was the most dangerous setup I have had. The silver plated copper screw in the center pin of the 510 connection on the atty was made of such soft copper that when I tightened the battery down it literally smooshed the screw head even with the bottom of the connection causing the short. If I hadn't of been damned luck and realized what happened as quick as I did and again I say DAMNED LUCKY I would have had a fully charged vtc 4 vent in my face.
Just because something looks good on the up and up doesn't mean something can't go wrong. There was no way I would ever know that the screw was going to smoosh in and short till it happened because I thought I was using it the proper way and had checked everything and was being safe and it still hard shorted and almost vented my battery. Just something to keep in mind....when it comes to hybrid mods there is no such thing as "being too safe" ...personally, I don't think there's anything safe about them at all, but please just be careful.