Muscle memory is exactly what it sounds like, you need more repetition. If you are becoming frustrated, you can try to reduce your cognitive load. ZSA has an app for all platforms called "Keymapp". It's primarily used for flashing firmware but shows the key assignments in real time. I use only 1 monitor but I've repurposed my laptop screen to always display keymapp so I can see which key/layer has the symbol I am looking for when I don't have the mental capacity to remember.
The default layers are pretty good, but I found programming the keys/layers to what made sense to me to be more beneficial. I use the heat map to see which keys get the most milage and program layers around that. Then I only program a few new keys at a time and get a feel for things. My words-per-minute went down initially but now it is back.
I have been tweaking my layout for about a month and am close to being happy with it. I've set myself a milestone that when I don't make any tweaks for 6 months I will buy custom keycaps that have my exact symbols/layers on each key.
The default layers are pretty good, but I found programming the keys/layers to what made sense to me to be more beneficial. I use the heat map to see which keys get the most milage and program layers around that. Then I only program a few new keys at a time and get a feel for things. My words-per-minute went down initially but now it is back.
I have been tweaking my layout for about a month and am close to being happy with it. I've set myself a milestone that when I don't make any tweaks for 6 months I will buy custom keycaps that have my exact symbols/layers on each key.