There are a lot of sense in all these answers.
However, this is an insight of a similar thing that happened to me:
I use to practise very hard as I was a late bloomer. Also classically trained including a lot of self teaching.
I liked Hanon and other exercises a lot but didn't like the way it was taught...just for the fingers...
It however made my fingers "too strong" and that problem migrated to other parts of my playing.
I had to adapt/change my technique with rotations, turn arounds when changing directions and other arms and wrists techniques.
This made me realise that actually, my 4th & 5th finger were stronger than 1 & 2 because of the emphasis these exercises put on the weakest fingers. I never thought of concentrating on fingers 1 &2 and took it for granted.
A further thought:
Biology has a lot to do with the way you play. There are new teachers emerging who combine classical techniques with new findings:
You mentioned that you haven't played for sometimes and even if your brain has remembered what to do, your hands, arms have probably changed physically. That's worth considering.
I personally discovered that my hand balance was not my 2nd finger(next to ring finger) but my first one(next to thump), which was due to some early sport activities and injuries.
With that in mind, I rethought my technique and adapted.
I know these are insights and not necessarily the answer this website requires but thought it might help
This guy is the guru at the moment. Here's a link to one of his video:
It is possible you were taught the very classical way, like a teacher hitting your hand with a ruler when your hand position is wrong. There's more up to date thoughts on piano techniques these days. The one rule I follow is always do what feels right. If it hurts, I am doing it wrong!
I suggest watching videos on a piano technique search.
One more thought: are your fingers tensing without you realising? Tension can creep in at anytime and it can take a while before you realise, especially if you've been out of the loop for a while.
Remembering complicated pieces is great but it s your body ready? Are you trying to run before you can walk?
I'd suggest you sort of go back to basics: scales, arpeggios. Start slowly with whole notes, quarters notes.... this should help control.
Whenever I am stuck, I go back to basics, even now. I always start my practise with scales chords or arpeggios works, just to warm up... I will always do that to keep control.