Virtual SC levels on Pro Tools

[Acousticwarrior]

Guys, need some guidance/assistance for an issue I have not encountered before.

Set up: 4 x S16 stageboxes, 2 x S3L-X systems ( 4.6.1.4), 2 x Macbook with Pro-Tools ( Yosemite Pro Tools 12.4 at FOH, El Capitain PT 11.3.1) 2 x production toolkit

Issue: Both systems record fine, all 64 tracks. Mon rig plays back at exact same gain level, when switched over to mic input mode. System at FOH for some reason records at about 15 db lower level overall on all channels. All settings at SL3-x seem to be like we have used them on many shows with other engines before ( this rig is a touring rental), so this might be an issue? Is there an overall level adjustment of AVB stream I do not know if? Any hints/ ideas, as this renders virtual SC completely useless for me. Any comments would be appreciated.