Thanks again themetallikid. I really appreciate all the help
I've just adjusted the ouput block to -5db for normal settings and 0db for the boost and it's miles better. Just a small amount of tweaking should now do it. I've also dropped the TS 808 into the mix as you suggested and that sounds great also.
I've always steered clear of modelling amps but for me the Helix (if you perservere) is great, highly intuitive and even addictive. This is my first post and ask for guidance and you've solved it, so thanks to you all
Cheers