Both OR Engineers did reset it at the exchange
Possibly best if we use the term "re-train" - guess you could check wheher your line was "retrained" after the most recent engineer's visit if you are still uncomfortable with the BB performance...
Sounds suspiciously as though the engineers
are doing resets. Using a remote access tool have the the profile wiped back to the 'out of the box' setting of 6db/fastpath.
There is of course no point in doing this unless they have actually found and resolved an issue, because it'll all just go Pete Tong again.
Not even sure why they are doing this, their access to this system is supposed to be for BB Boost tasks only, and the OP's CP don't supply boost visits, just SFI's.