Need Help: TEX + XV5080 + Arturia 49 midi keyboard in Combi

[Kahnn]

Gig:
TEX 76
Roland XV-5080 with 4x SR-JV80 and 2x SRX boards
Arturia Analog Experience The Laboratory's hardware keyboard/controller (midi in, midi out [USB port not used], 49 keys with velocity and channel aftertouch, split into 2 midi channels possible)

What I want to do:
TEX as the master, the other two are the slaves.
I want to be able to prepare combis like the following:

COMBI #001:
Part 1: GCH; Bass; INT program; F1-B3 (on TEX keyboard)
Part 2: Midi channel 2; Piano; INT Program; C4-G7 (on TEX keyboard)
Part 3: Midi channel 3; warm pad; INT Program; C4-G7 (on TEX keyboard)
Part 4: Midi channel 4; wind FX; INT Program; E1 (on TEX keyboard)
Part 5: Midi channel 5; sweep pad; EXT2 [XV-5080 patch]; C2-B3 (Arturia keyboard split in 2: lower split)Part 6: Midi channel 6; Shakuhachi; INT Program; C4-C6 (Arturia keyboard split in 2: upper split)
Part 7: Midi channel 10; drum kit; INT Program (Arturia's drumpads)

COMBI #002:Part 1: GCH; Bass; INT program; F1-B3 (on TEX keyboard)
Part 2: Midi channel 2; Piano; EXT2 [XV-5080 patch]; C4-G7 (on TEX keyboard)
Part 3: Midi channel 3; warm pad; INT Program; C4-G7 (on TEX keyboard)
Part 4: Midi channel 4; wind FX; INT Program; E1 (on TEX keyboard)
Part 5: Midi channel 5; sweep pad; ; C2-B3; INT Program (Arturia keyboard split in 2: lower split)
Part 6: Midi channel 6; Shakuhachi; INT Program; C4-C6 (Arturia keyboard split in 2: upper split)
Part 7: Midi channel 10; drum kit; INT Program (Arturia's drumpads)

P.S. The main difference in the 2 combis is that XV's patch is played ON Arturia midi keyboard in combi #001, while it is played on TEX keyboard in combi #002.

My 'Solution' which doesn't work properly:Arturia (midi out) => (midi in) XV-5080 (midi thru) => (midi in) TEX (midi out) => (midi in) Arturia
This seems ok, except you hear XV patch not only when you play Arturia upper split (concerning combi #001), but you also hear it when you play TEX'es keyboard.
The rest of the combi sounds and works just fine.