Just use "Assassin", not tiefling. You don't morph anymore.
Edit: This patch seems to be quite a buff for Limpetsin, on the paper anyway, I haven't tried yet past a2. Without morphing your every speed is faster, especially attack speed so it's not suicide to try and keep SR up in some situations. And Bloodbath can be used with anything, even though it's only 3% now I noticed that early on it really shines.
And the morph was fugly...