Tried the 6dp17's, still runs best with either the 5fp17 or the 6dp1. Not ruling anything out yet.
Both the 5fp17 an the 6dp1 very close to the same by my butt dyno. Both need to be run at or on the leanest setting.
I did move to 2.0 slides and readjusted my pilots screw and the bog off the line is gone, now I have to downsize my pilots a bit, I'm 2 turns out on the screw.
I am little surprised how when the needle is at or near the leanest setting how much it affects take-off, pilots circuit and cut away become very critical.
When I was testing the 6pd17's any setting leaner than the middle clip and the bog on acceleration would kill the motor and it would get make the stumble in the middle terrible! Moved back to the 6dp1's leanest setting and it accelerated fine with no other changes.
That tapper point is killing me and when I richen up any of the needles I have the stumble at 5500 gets worse.
Seems like it wants to be lean right at that 5500 rpm, (I need fuel injection

)
Those spec II's do hit hard and I think they are messing with my set up at that 5000-6000 point
But they sure are fun after that!!