R53 is a totally different animal compared to 47 of same/similar.
Sponge hardness matters.
For a number of years, including where I nearly cracked past 2100 USATT... SOFT modern dynamic rubbers were what suited my kind of impact and looping on FH...
I could also use about anything on BH, but after a lot of testing, I simply landed a couple more balls on table out of a hundred, so I kept soft on BH...
... as my FH impact got better, I moved to medium and then medium/firm sponged Euro rubber.
A player can and will assess what works and accept reject... it is a process and also a player's impact can improve.
I wouldn't recommend 53 degree sponge for a player's BH unless they were a full time monster pounder on that wing, which pretty much is the pro and elite amateur level.