Here are a few of the loads that I have used over the last three years. I have ran these loads out of two different G35's. One gun has the stock barrel and the has a Briley custom barrel. Both gave about the power factors.
180 gr BBI's
3.2 gr WST
128-130 PF depending on temperature
This load is extremely soft I stop using it simply because I felt it made the gun feel too sluggish.
165 gr BBI's
3.5 gr Titegroup
138-140 PF
This is my current go to load.This load is pretty snappy and feels like the sights snap back on target faster. I believe you could probably reduce this load quite a bit and get the PF down if you wanted it softer. Just remember that the softer the load the more sluggish it is going to feel.IMHO
I have also shot a bunch of Bayou 155 grs I just don't remember the load right off hand. It was the snappiest of all the loads though and I didn't really care for the bullet profile.