I think transmission is already broken. same thing happened to me, i have an fd2 with auto tranny. tuner boosted it to 10psi instead of 7psi which i told him. after a few weeks, i noticed some problems with my transmission. there were clattering noises coming from the transmission, and sometimes heavy jerking when shifting. tranny doesnt engage to next gear right away when up-shifting. normal driving now sucks because of these problems. i believe shifting from first gear to second with 10psi was too much for the transmission to handle. Right now i just ease off the gas pedal when shifting so that the tranny wont go completely, atleast the car will still run and still can use it. =( im saving money to get manual transmission later this year.
I hope it is not yet too late for your car. If i were you, boost first with only 6psi and target atleast 180whp and dont go beyond 200whp. that is a lot of whp already from the stock 120++ whp. there was also a tuner from our country who boosted his 1.8fd to 180whp and the car was fine.