How to stop overmasking during interviews? This set me up for failure, AFTER I get the job.

I'm tier-1 autisic. I mask heavily through interviews to get the job. I've done this twice now, and I was let go from both (one after a 6 month probation and the other after a year. Second one they bullied me until I quit but thats a different story). I think it's largely because my mask eventually falls off.

My problem is that I overdo it in interview. When I finally relax, my true self, which is introverted and silent, comes out. I still smile and greet and attempt to small talk and do my work very well but it doesn't live up to the initial hype for NTs I think. It's a jarring shift rather than a gradual one so it's probably really noticeable. If I try to dial it down I usually don't get the job anyways. So I'm in this situation of constantly trying to find the right balance.

I’m starting my 3rd job since college, after 2 years of unemployment and I can feel it coming again. I killed it socially in the interview and even made them laugh, but on the documentation signing day I had to introduce myself with other hires so I got anxious and fumbled over my words when everybody was staring at me. So Im already dreading the crash.

Can anyone relate? How do you manage this?

Also, unrelated but I do this in public too (supermarkets, cafes, transport etc.). It’s involuntary at this point. I hyper-mask and probably give off a super extrovert or uncanny valley vibe depending on the person, situation and my mood. I’m naturally very reserved and has RBF or an awkward smile, but since that never got me anywhere in life, I guess I developed this as a coping mechanism. I'm aware of it, but I don't know how to dial it down or find the balance.