So look to the simple things first and assume there's a combination of them afoot.
For six months, it sounds like you have made a lot of progress and are pointed in the right direction. I suspect that @Gamma is right about it being a combination of things.
Considering that you have a handful of razors, I would be hesitant to go down the reset bevel path unless there is a noticeable difference between how your different razors are performing. If and when you are ready to go down the reset bevel path, use a sub 50 USD used razor or Gold Dollar to learn. Don't make your first mistakes on a valuable Le Grelot!
Not sure how you shave, but (speaking of ideas) you might want to explore the use of two hands and develop a good backhand stroke. Watch this legendary video. At 3:10, Chimensch uses a backhand stroke to shave across the grain (I assume) and then at 3:30 a forehand stroke to shave with the grain.
I usually do the opposite. For my left* cheek, I first use a forehand stroke with my left hand to shave downward with the grain and then a backhand stroke with my right hand to shave toward my mouth across the grain. The idea came from this video. Just pay attention and go slowly the first few times.
The backhand stroke is also good for shaving around your nose - again, just go slowly.
*From my, not the mirror's, perspective.