Hey Mark -- Unless your area is really overrun by insects, that's a load of chemicals you're using. I do understand, becaus we had a similar spray program . . . until the chemicals caused our dog to begin suffering grand mal seizures. We decided pretty quickly that perfect foliage was not a good trade-off. But I sure hope you are using a mask and at the very least chemical-proof gloves.
If you can't find the rose slugs, they are likely already dead.
Your feeding schedule sounds very good, I think.
If you want to really push the roses, you might play around with some alfalfa tea:
https://www.plantsmartliving.c...
I swear, you can almost watch the plants growing like mad.
