Cheers Andrew.
The best results I’ve seen with P125 were around the 40-50mcg mark. Ideally I probably would have gone for about 10mcg per spray, but my limited remaining stock didn’t allow it 
So 8mcg per spray it shall have to be. Given i want to be around the 40mcg mark i’m looking at 5 sprays - so the other ingredients I mixed to get a reasonable but not overpowering amount at that many sprays.
Having said that, I’ll probably start out a little lower in the spray number and see whether the P79 can intensify the effect and limit the need for too many additional sprays.
I was thinking more along the Instant line with this - heavy on one particular thing with a couple of little harmonisers and intensifiers - as I’ve said, I think P125 does a lot even just on it’s own.