it really depends on how consistent you are and how risky.
if you're a spreader, ie: bund/bobl a know some grads at Fortis who are on 200 by 100 clip, with upto three clips, I think they'll be going up to 300/150 sometime soon.
Some of the Marex guys are working 1000 lot clips in the bund outrights. You cant do that if you have huge drawdowns obviously.
Low risk = big size.