Agree with the others that said your Pimps are still viable. Last time i ran through uvhm with Zero i think my Pimpernels were still killing stuff til at least lvl 57-58 and probably a little bit longer. They are just that good.
Also agree with tweaking your build a bit. Killing Blow instead of Iron Hand and Execute is nice to have instead of 1 point in Precision.
I’d also leave Precision empty and use One Shot One Kill instead. Precision is nice for shotguns and a couple other guns, but seems kinda useless to me if you’re mainly using snipers (Skullmasher is an exception). Even if you are using shotguns, OSOK is still better to grab, IMO. Precision can wait til leveling up some more if you really want to use it. Before that though, I’d want to max out OSOK and Followthrough before thinking about Precision.
If you’re doing a straight sniper only play style, then getting down to Critical Ascension would be your main priority with your next 2 points. Then spend your last 15 points in the Bloodshed tree.