The spinnier and the best for me, are two different rubbers.
The spinniest I used, I really dont know, maybe Sanwei t88-I,on loops, on serves maybe haifu BWII.
The best for me is Tibhar 1Q XD on FH and Aurus soft on BH, if I could, I would join the service of BWII, the loop spin from T88-I...