Well i got a theory on why the fixed works better. If you draw in suppport/horisontal lines in a chart (say 1h if ur algo is in 1h) and you will quickly see that theres a roughly fixed XX pips in between the levels of support/resistance.  Obviously sometimes price barely dosnt hit the level and sometimes it zooms past it. But with fixed you can at least (sort of) put your stop/target on those levels.

At least from my own personal experience i see my algos setting stop loss + target more or less on the levels of support and resistance, its quite amazing to watch to be honest..  might sound crazy but it has happened in the majority of the trades ive watched happen.

And yea Vonasi, obviously its curvefitting, but logically, lets say you make your strategy, you optimize your entry and exit, then you add your stop loss and profit target. You have already “made” your entry and exit, all your asking is to optimize the target and stop loss of those trades. And im not talking about “crazy stuff” like Set target 24 pips on 5 hour chart..

Like in wall st im usually around 70-100 optimized pips stop loss is working good on 1h breakout/momentum systems. Again, this is my experience only..