Failsafe activating after shift.

[Iworktofish]

Greetings,

My setup:
*97 BMW M3
*Technique Tuning Stage 2 turbo
*8psi wastegate, 13psi normal, 15psi with 50/50 meth
*HFS-6 with single 1mm jet and 0.7mm HSV restrictor
*Eboost2 wired to only allow HFS-6 to see IDC >13psi using auxiliary output to relay
*Coolingmist 1.5gal U shaped tank in trunk

During a single gear pull, system is spraying above 13psi as intended, indicated by 5-7 bars (best I can tell, hard to see & drive simultaneously). However, after I shift to the next gear, failsafe is activated dropping me to 8psi wastegate, and either stays active, or sometimes comes back after short delay.

I have tried adjusting the SC to ensure I'm getting ~5-7bars of lit LED's.
I adjusted WL 2 clicks CCW, WH 2 clicks CW to open up the window.
I have turned down the failsafe RST to minimum recover time.
Meth tank is not the greatest design and prone to sloshing (per Howerton) but it is full, and sensor is near bottom.

I am still getting intermittent failsafe activations after shifting to the next gear. Any ideas what would cause this and how to fix?

Thanks!