I'm with you on that. In every back-test I've done, partialing has come out low on the ROI list, and the commissions are important to consider.
Of course, with higher share size, the commissions aren't quite as impactful.
For me - not necessarily 1.5R, but some R, and being able to try it with a .5 increment is incredibly helpful. I am finding that taking smaller R's and having a higher win rate is more beneficial to me so far.
ETA - And yes, all or nothing most of the time. I find I start partialling out too much and end up wasting my money on commissions.
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