M4300 stacking

Hi!

I'm currently running a stack of 3x m4300-96x, located in different parts of 2 buildings. Running a ring is not possible, so switch 2 and 3 are each connected via 4x Qsfp+ Stacklinks to the "Stack Master". i added 3 more M4300 28G via 10gig fiber ports to the stack today. now i have 6 switches showing up within the stack configuration. i configured the vlans. everything within the 3x M4300-96x is working fine, but everything connected to the 3xM4300-28G won't work/show up on the network ( Dante devices, PCs,....) I'm not sure if i got something wrong, but a M4300-96x supports 16 stacking Ports no matter if it's 10 or 40 gig, or mixture?

So if i'm correct my setup should be working:

Stackmaster:

1/5/1 40Gig stackport 1 to stackmember 2 (second M4300-96x)

1/5/5 40Gig stackport 2 to stackmember 2 (second M4300-96x)

1/6/1 40Gig stackport 3 to stackmember 2 (second M4300-96x)

1/6/5 40Gig stackport 4 to stackmember 2 (second M4300-96x)

1/11/1 40Gig stackport 5 to stackmember 3 (third M4300-96x) (waiting for the apm 402xl  card)

1/11/5 40Gig stackport 6 to stackmember 3 (third M4300-96x) (waiting for the apm 402xl card)

1/12/1 40Gig stackport 7 to stackmember 3 (third M4300-96x)

1/12/5 40Gig stackport 8 to stackmember 3 (third M4300-96x)

1/10/1 10gig stackport 9 stackmember 7 (m4300-28G not installed yet)

1/10/2 10gig stackport 10 to stackmember 6 (third m4300-28G)

1/10/3 10gig stackport 11 to stackmember 4 (first m4300-28G)

1/10/4 10gig stackport 12 to stackmember 4 (first m4300-28G)

1/10/5 10gig stackport 13 to stackmember 5 (second m4300-28G)

1/10/6 10gig stackport 14 to stackmember 5 (second m4300-28G)

1/10/7 10gig stackport 15 to stackmember 8 (m4300-52G not installed yet)

1/10/8 10gig stackport 16 to stackmember 8 (m4300-52G not installed yet)

Looks a little confusing. SDVoE traffic is pretty much staying within each M4300-96x, Dante, NDI, data is mostly used within the main location (Stackmaster and the M4300 28&52G)

thanks for your help!