Hi, have you made sure that V2 and V3 are the right tubes, not reversed by mistake?
I'm thinking you can't turn the tremolo intensity down for some reason.
What you could do if you have a 12AU7, is put that in for V2 and replace the 12AX7 with the 12AT7, which will lower the intensity and maybe give you better control. Just a thought to help pinpoint the cause, not suggesting it will cure anything.
I wish I could explain the tremolo circuit but have trouble figuring it out myself.
