"More herbicides - measured in lbs/acre - were used- and are used - on non-GMO crops, than were/are used on GMO crops."


"Makes sense to me"

Okay, so you agree that more herbicides are used on non-GMO crops, than on GMO crops. 

So, why, in your initial post, did you single out GMO Crops?  Why not say "all crops are drenched with pesticides?"  Better yet, why not say "NO crops are drenched with pesticides."  

Why not say " Crops are treated with yield-enhancing products to increase performance and profitability."