Here is the latest setup I have been running, I have been working on this for a couple months now, and have finally gotten it to feel exactly how I want it too. This setup has been run on both tacky clay, and dry clay, and has worked amazing on both. The biggest change I have made is going back to the 2 hole pistons. We have found that the 3 hole pistons don't re-act like they should on the tracks out here. With the 3 hole, the shocks don't work like they are suppose to, they don't soak anything up (Too much pack).

FRONT:

2-B Piston, 32.5wt Losi oil, Orange Spring
Shock end un-screwed 4 turns,
Shock mounted middle on tower, outside on a-arm
2-2 Link (Middle on Bulkhead, outside on caster block )
1mm washer under the ball stud
Axle's up
30 degree block
No spacer.
-1 degree of camber
0 degree front toe

REAR:

2-C Piston, 30wt Losi Oil, Dark Yellow Spring
Shock end un-screwed 4 turns (STK RB5 Shock Shaft)
Shock mounted middle on tower, middle on a-arm (Mid Arm Conversion)
2-2 link (Middle on Bulkhead, outside on hub )
No washers under ballstud on bulkhead
2mm washer under ball stud on hub
Hubs UP ( for those with the old hubs )
Wheelbase (Long for tacky track, Middle for med traction, Short for dusty and dry )
-1 degree of camber

MISC:

Battery Forward
No weight anywhere in the car
Med downforce wing
Wing height -2, 10degree angle.

Not sure why you feel the 3 hole pistons don't have as much pack. The 3-B have the same size hole as the 2-B but the 2-B only have one hole.

The 3 hole pistons should have a lot less pack then the 2 hole pistons.

The 3B hole size is MUCH smaller than the 2B hole size. I found the 3B's not very good on rougher tracks (3B's pack up too much) and switch to 2B's (and 2C's in the rear) for those conditions.

I've been running a set up close to Ben's since I got the car last May as I was looking for a set up similar to my old B4. I found it worked quite well and it has become my base set up now for rougher and looser tracks.

Edit: Not sure about total oil flow through both 2B and 3B pistons, but I would think even with 3 holes, the smaller holes will make it pack up more than the 2 big holes in the 2B pistons.

I have 2 sets of spare shocks, and I built one with 3 hole, the other with 2 hole. You can litterally can feel the 2 hole work faster, feeling softer, then 3 hole feel like you have 50 wt in there, and are just slow to re-act. Try it out next time your building shocks, I didn't want to believe it. I also tried the two shocks back to back to back, and the 2 hole were night and day better.