Have you taken a look at my guide? It's fairly updated.
http://forums.warppo...erchaser-guide/
It doesn't matter what build you have at end-game, but 100 total Vit is highly recommended. This is especially true for WoE. kyrios91 has pointed out the basics already. You really can't go wrong with Vit, Int, and Dex. Str can be used for Masquerade resistance, because it increases your overall Weight Limit. Agi will help you with your cast animation for certain skills and also helps you resist Masquerades a little better.
The formula for Masquerade success and resistances is in the Balance Patch notes in my guide.
Another thing: Severe Rainstorm was never a thing Chasers should have used for WoE. They were never a main killing class, aside from Shadow Form pre-nerf and Fire Trap pre-nerf. Even then it was easy to out-pot Fire Trap. You shouldn't have died to it if you weren't underleveled though. They're better off as a support/debuff/annoyance from the get-go. That's what Fire Trap was. It was there to slow down your enemies or annoy them.
Shadow Forming to kill players isn't a thing and never really was a thing in the first place. It was so easy to counter Shadow Form back then and it's even easier to counter it now. Then again, the unaware can still fall for it. Revealing skills like Ruwach and Sight will remove Shadow Form from a Chaser extremely easily now, so it's not recommended for you to spam it at all. You're better off doing other things.
Rapid Throw is the new skill you can use for killing single targets by chance though, but it can get expensive and will miss quite often.