Hey Simon,
I think you are doing a good job. This is exactly what you need to do…experiment, test and progress…
Now, regarding this strategy, I think you have a lot of exit conditions. Try to remove at least 2, and repeat the optimization. See if this will bring you better profits. I do not like having the strategies losing recently but if you look at its equity line there was such a period in the beginning. So yes, it worths testing it.
But once again, try to remove a few of the Exit conditions. they might limit the optimizer for finding better parameters at the end.