I always prefer the wider lobe seps when running nitrous , less charge gets pushed out the ex on O/L plus the fact a wider lobe sep will help get the spent gasses out earlier , i ran a similar cam & CR to what you've posted & picked up a few tenths by advancing the cam a few degrees , you may of faired better if you went with a 114/116* lobe sep , as regards timing #s i would start off pulling 8* with a 150 shot & work from there , i used to run a cheater plate & reversed the nitrous fuel jet with 5.5lbs fuel pressure , i also ran a seperate fuel pump dedicated to the nitrous , a fuel pressure switch should be fitted to shut the system down when low/no fuel is detected , you will get varried opinions on this which makes for interesting reading , plenty ways to skin a cat.