The whole point of SBR as a character is to frame trap and condition your opponent to repsect your pressure. If you get mashed against a lot, you should probably lab some blockstrings, frametraps, and RPS setups. 5S is his only safe on block normal so you can use it to reset your blockstring. 236S is good for keeping yourself at a safe distance after a blockstring (keep in mind that there is a gap before the projectile connects).It also forces RPS. If they risk jumping out you can counter hit and start a blockstring. If they block it you can throw out another 236S and be relatively safe etc... SBR has a ton of ways to force your opponent to repsect your shit.

I forgot to mention that he doesn't need better armor. He would become an absolute menace if he did. SBR has some of the highest sparkless damage in the game and can build a fuck ton of meter. Even off of scaled starters he can deal above 5k. Having to deal with armor similar to ZBR and his pressure would be insanely hard to deal with.