What are yall spraying with? 41% GLY from TSC or Round up? I don't know if the 41% Gly is as strong as the roundup. It's cheaper but I think its a little weaker. I put 2.5 gallons in my 40 gallon sprayer and use the boom. It works but just seems to take a while.
Way, way overkill on the rate.
41% of the same ingredient in the same size container is going to be the same, regardless of brand.