Inital adjustment on willwood adj prop valve on 4 wheel disc brakes??

[64stpside]

Hey guys,
I just got a 4 wheel disc brake kit from (auto city classic/toms classic) put on my 64. I decided on a willwood adjustable proportioning valve (the grey one, line in, line out, screw adjuster). I put the screw adjuster on the valve 1/2 way between all the way out and all the way in to start. I took it around the neighborhood and it seemed to do good but i haven't gotten into "panic stops" yet.
Just looking for anyone with experience with these wilwood adjustable valves on where your initial adjustment was.