[Tom Goldman]

The line lock will help with keeping the roll at a minimum, but I'd go after the cause of the roll.
Is this a PG with helical gears ? could be too much end play, lo line pressure ,or a slow or sticky solenoid.
TH400/ 350 ,you need the line lock.
If you have bump and rebound adj. on the front shocks tighten the bump a little, that will slow the dive a little.