If it works for you,who cares what I think
But I do maintain muscle memory doesn't work.Its your mind that control your muscles and as such you HAVE to work on your mind to improve your game.What you are doing on the range is training your brain to move the muscles as you want them to ove,the muscles don't have memories on their own,you do.So working on the mind,ie preshot routine as an example is how you train your mind to maintain the swing on the course.You simply learn how to trust your swing out there and it will not collapse.
Swing thoughts on the course are just course destroyers.Trust it,erradicate swing thoughts by practising as you play and vice versa.
Your body doesn't remember anything,thats physically impossible.Its your brain that does all that for you which is fed by your mind.Work on your mind and forget muscle memory.Practice clinically with one or 2 swing thoughts on the range then trust it on the course.
But hey,i'm sure there are many pros who do what you do and as I say,if it works,what the hell!
I would be interested to know how you get on in the future.I would be surprised if you din't have a few bad sessions and the result of these is yo slowly down and taking your time.
Also,I will chuck this in but you probably know it anyway,tension creeps in during practise and you don't notice.Well I don't anway.So i use my preshot routine which includes and anti-tension waggle (think Nicklaus) to ensure i'm not tensing up.Its easy to over analyse when in fact all thst happened is your arms have tensed up.I also spend most of time on the range working on tempo.
all the best!