just 20 - 50 although i recommend you put them way lower, like
f.e. 5 on prod.
imo, u use trade scripts to do the work, if you want to decide for every fucking thing on your own, and think you are smarter then the trade script you should remove all trade scripts and go back to manaual toplists which you can adjust every day
well, my recommendation is: let the thumbs and the trade scripts their own live, TP has been prooved to work just sweet on all various sizes of TGP / MGP, donīt fuck around to much with settings, and if you change something make it in realy tiny steps
f.e. if you want ot raise the skim, donīt jump from 50 to 70, just do 2-3% every day and see how your site responds