XR4Ti low vacuum readings

[Mazda_Powered]

Trying to help out a friend with getting some insight as to what could be up with his car.

I'm nowhere near it to help, so I'm doing what I can since he's usually busy with work.

We've already replaced all the vac lines on the car and changed out the plugs/ignition wires about a month ago (unknown mileage on old setup)

The car seems to idle around -15 vac consistently.

Decel the car drops to -20 vac.

Cruising the car is -5 vac.

Idle with some accessories on he's advised it will lose 5in of vac as well.

I've suggested to check his ignition timing, since we're unsure of what the car is set to...

Other then smoking the intake system for vac leaks, I'm out of ideas lol.

Setup is:

2.25" hardpipes to a FMIC with a Forge atmosphere BOV
ECU and VAF upgrade (idk the specs, but they're OEM upgrades)
3" exhaust off the downpipe elbow, no cat
MBC set to 17psi w/ the OEM controller bypassed
EGR delete
OEM style spark plugs at stock gap (around .032)
OEM ignition
Stock engine with 61K

All the changes we've made so far haven't fixed anything. So input would be nice

pics are old, so it has the old vac lines and ignition wires on it stilll...figured pictures are worth a 1000 words tho...lol