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I use H3 39 degree. Yes I find the Rxton 3 blue and pink to be harder than H3. It might have something to do with the top sheet. Both Rxton blue and pink, I boosted the heck out of it but still little to no catapult effect. So I gave up. Maybe their top sheets are just hard, making the rubber as a whole too dead for my liking.
The topsheet for the Rxton Blue took a few hours to break in and maybe booster on the sponge doesn't do the job.
I've never tried it before, but I think one of those massage guns would do a pretty good job of breaking in a rubber from the topsheet side.