What bars (size) are you running ?
I have .840 bars on my B body,,,,and it will "sag" over time,,,if the car sits for an extended period of time,,or after tying it down on the trailer....
I now keep the front end "jacked up" at home ( jack stands,,etc ),,,and also at the track will lift the front for a while after i take it off the trailer....
This has helped,,,and i have had to adjust it alot less.
For me,,,i think it's the very light weight bars,,,and the B body weight of my car....
I might put a stronger bar on mine this fall..