CR is a knats cock under 8.7:1.

Would like to be running 10psi in the end. I have dialed out all the det so far at 7 psi but it just seemed like quite a low advance figure for that boost/cr setup.

Do you think the lack of squish makes that much difference?

Not sure that shed loads of fuel is the best way to combat det / run an engine. Our local so called tuner once showed me a RR printout of his cossie running 9:1 afr and seemed to think it was fueling great!