If you are using a last step injection system your water quality is more of an issue than your chems. I have only been doing this since '99 but I catch on pretty quick.
I plan to be on a beach full time before forty years of this.
I agree with Meat as usual. I got of topic earlier. White vinegar is recommended by many to clean out the chemical injector. It won't do much for heat exchangers and the like. Descaler is needed for that.
Sounds like a good enough reason to me to descale. I can't see a down side even if it didn't need it. If it fixes your problem, it was a cheap fix. If it don't it was still a cheap first step.