I've since sorted some of the issues... I now have a phasing issue on the amp but everything else works great.
My mix is on 100% on the fx loop block
My 4cm is guitar into helix, - 1/4 output to Amps return,- Amp input into send 1 - and return 1 to amp fx loop send
I have no modulation effects. The snapshots change my amp channels fine its just the weird phaser sound especially in the dirty channel
Thank you for your reply!