Ive literally just gone from my old trusty g502 to a viper v3 pro today..had a couple of games on battlefield 2042 and im amazed at the difference in feel and accuracy..im quite surprised you dont like the viper v3 pro for fps games.
Tracking etc seems WAY better than the 502 and being able to set it at 2000 polling rate( can go to 8k but 2k is enough for anyone) makes things hell of a lot smoother, my 502 has lasted me around 10years i think,and is still going strong, will this last as long? im not sure, but seems built solid.
My accuracy with the viper has defo improved big time though and the weight of the mouse seems perfect to me.