I would even suggest multiple TECCRs. Say 3 TECCRs, then TECF, TECC last. When I run into a problem I do it from the UIT, seems to have a bit better success rate.

Stupid question, all three floors are fronts? If you have rear entrances you need to do a TECR after the TECF. You can also make sure the mapping is accurate with a TECCV.