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I was thinking to try R50, but now R53 is available I don't know which of the 2 would be good.
YASAKA 翔龍 (SHORYU) https://www.kokusaitakkyu.com/shopdetail/000000006622/ct1350/page1/order/
[for info, JIN Takuya is using this YASAKA rubber on both sides]
IMO the top sheet makes a much bigger difference in feel than the sponge.