You're welcome, of course....not sure if I helped much though.
Also, I doubt you'd find the product (Zylam) I recommended at Lowes.....the place in my link is as good a source as any though - good pricing and fast shipping.
There are other systemic insecticides though - including one that they should have at Lowes (or HD) from Bayer...such as this one:
https://www.bayeradvanced.com/find-a-product/tree-shrub-care/12-month-tree-shrub-insect-control-landscape-formula
Like your attitude though....never give up!