Hi Mick.
We've had Afco's on front and rear from the start of the season and we're just getting to see what happens with what settings, we've managed to accumulate some useful, though rough data.
The first thing we've learn't is to get the slick pressure correct, we're running more pressure than we ever have lately.
Also don't get too hung up on the 60ft times if you want to go quicker, we've discovered our car et's and mphs better with some spin off the line.
We set the car up to do medium wheelies last weekend, just dropping the front at the 60ft and the 60ft times were great, approaching 60ft pb's but the car wouldn't mph and et like it should have done, even in those conditions.
We left it at medium wheelie setting because the car was pulling the tyres out of the lights and we were getting too close to the red (all of them were o.o with some o.oo's too). Eventually we did go red (0.009?) in the semi's
So far on our car we've learnt that good 60ft = good reactions, slower mph and slightly slower et's.
Controlling the rear rise with ext damping helped considerably and works alongside with tyre pressure (watch for excess wadding or slamming the tyre into the ground). Compression can be used to induce or control some spin further off the line.
Of course this all works in conjunction with what the front does and if wheelie bars are fitted, we're still finding out stuff but a lot of what being said on this forum works in practice on our car.
Here's a typical launch from the weekend, Courtesy of Richard Smith, we still think we can do with a little more air in the rears
http://rdsmith.zenfolio.com/dragstalgia-2014/e1eb00eef