My two cents. Full disclosure I’m still working out the bugs in a simulated environment.
You need a methodology but can’t get stuck in the making of a method. For back testing even if you use larger time frames, choose only your trading time frame.
On your TTF, you either have a signal or you don’t. You can learn to use your LTF later creating rules and filters.
But, your TTF sets the trade up. Signal, initial stop loss, target, management of trade.
For you, in an effort to have unambiguous signals, you’re reverting to Technical analysis.
You’re signal should be so fucking simple, it’s there or it isn’t. For example, in a downtrend, on the second pull back, price rejects the 9ema and I sell for another leg down. This is on TTF. later, your LTF can filter the trade meaning maybe your at yesterday’s low and price tends to pause there.
You’re building a slot-machine, that you pull over and over, knowing that a SERIES of trades produce a positive expectancy.
Make your signal dumber. Make yourself dumber. It all works and none of it works.
As I’m getting dumber I’m getting better and been positive in SIM. I only use the 3m and 15m.