I think you're probably OK.
I'm actually getting ready to do a foliar with Regalia myself. I use it as part of my IPM but I only use it about 3x total during the entire life cycle from clone to harvest...less if I'm alternating with another product that also induces SAR and/or ISR. I've found overuse of any of those type of products can reduce yield.
This applies to leaves as well roots.
Jasmonate acid, Salicylic acid, harpin proteins, chitin ect should be used with reason