I have a the RR.84 GC and my favorite blades are Kai SS, GSB, 7oClock SP & Personna reds.
If you find the razor is not aggressive or efficient enough for your technique just slip in a Kai SS blade, it is wider than a Gillette standard blade by 9/1000 of inch or 4.5/1000" per side. I like the Kai SS, Sharp & smooth with excellent longevity in my RR.84, it made this razor so much more to my liking. A tuck or 2 of Kai SS blades are good to have around for mild razors you wish hand a little more blade feel IMO.
Tried several blades in my .68 Gamechanger. None compared to the Astra Superior Stainless. But full disclosure, it’s the blade I use 95% of the time. It is simply the best match for my skin type and my limited skill level, and it only runs $0.08 USD per blade. YMMV.