Are you 100% positive there are no adjustment screws, that will close off the bypass holes? If they are indeed just a passage from one side of the plates to the other you could just pull off the ITB’s and pack the holes with JB weld and then smooth them off once cured.
Sounds like the TPS is shot or else the loose wire problem you reported previously is not correctly fixed. Also, I would be sure to check your input voltage and your output from the TPS with a multimeter to be sure of the values and not some odd problem with your modified ecu set-up.
Could you please clarify the changes in MAP pressure? Are you seeing more vacuum initially or after a little while when the revs go up?