CDO - welcome to the forum (very welcome actually as you've read and researched before posting)! It's been hinted at in the other responses but , If it ain't broke, don't try to fix it! One of the tenants here is to keep things simple by adding only what you need to to correct a problem - this also has the advantage of saving you $. I, personally think that cya = 25 is the perfect ballance between keeping a chlorine residual vs the reduced killing power, however I know that Watermom keeps her's higher and Duraliegh has just upped his, and they know what they're doing.
Congrats on a great post, you've gotten nothing but all-stars to respond (myself excluded ) I like the cut of your jib!!