The way I see it, there's no such thing as overkill when sealing below grade basement walls. Mine are concrete blocks on footers. They were parged with a coat of concrete, then I put on 2 coats of Thoroseal, then 2 coats of black mammy. I used two 4" drains in a couple feet of washed gravel. It's been there since 1987 and never a damp spot. :)