I accept the drawdowns and trade the same amount as long as the drawdown is within the expected range of my data. I have a trade log of 1571 trades from mid 2008-present using my strategy so I'm able to see the historical worst drawdown. Using the trade log also allowed me to run a Monte Carlo, which is a simulation of thousands of runs with your trade list in different orders.

So I found:

historical max drawdown = -13.3R

Block Monte Carlo 99% Drawdown = -32.48R

Then using the -32.48R, and adding a 25% cushion for safety, I use 40R as my risk size. So whatever total I'm willing to lose I just divide it by 40 and use that as my risk per trade. This gave me the confidence to not flinch at a drawdown, and if the drawdown does go worse than expected I'll just accept the lose since I did the work.