I totally respect that players will use whatever they feel like what suits them the best but I am afraid I strongly disagree (that equipment is not one of your problems)
I am sorry but SP as a secondary weakside rubber is a HUGE problem & a liability in almost all cases (I am not saying you may not be one of them)
I am writing a separate post on weakside / strongside , primary side / secondary side rubbers as applied to forehand & backhand & also somewhat as applied to your same rubber both sides philosophy drawn from hardbat era that you discussed elsewhere on this forum. I will explain this Mima Ito / Hou Ying Chao syndrome there further
Oh, well I guess I'll just ignore the coach I train three hours a week with and go with whatever you, a random nobody on the Internet, says about my playing with SP. This kind of shitposting is why the video footage safe thread got created.