Ohhhh I've been a little negligent here...
Since the last post, I have got the 150 mains in and have drilled the vacuum holes in the slides to 3mm.
The difference is quite awesome
Probably for someone else it's not a huge difference but I can really feel the much improved throttle response... much snappier!
I also discovered I'd messed up my mixture screw settings yesterday and had the left one at 3 turns and right one at 2 turns... :
So, after setting both to 2.5 turns yesterday and more fiddling today, I ended up at 3.5 turns but still feel like it's a little poppy on decel with a closed throttle, so I've gone 3.75 turns this avo and will see how that goes tomorrow.
I need another good test run to check it all out thoroughly (commuting isn't good for that) but I think I'm pretty close and will probably leave it like this at least until the dyno day, which is 18th May incidentally.
So, just to summarise where I'm at:
Pilots: Stock 17.5
Mixture Screws: 3.75 turns
Needles: Stock, richest (lowest) notch 4C3
Mains: 150
Slide springs shortened ~20mm
Vacuum Holes enlarged to 3mm