Hydraulic brake balancing

[Pdgx]

Has anyone had problems balancing brakes on hydraulic conversions (46-48 backing plates) ?
Brakes have been re-bled with no air found; mechanically adjusted each brake to just before drag - but it’s repeatedly pulling left, with only the left front with decent braking effort. Any further tightening of right side brakes causes lockup while adjusting.
It appears the left front (with the shortest hydraulic line) is getting activated first, and the others are not catching up. Hard stopping on gravel, locks the left front only.
(Are there any restrictors in the hydraulics, like modern vehicles, to make up for the difference in hydraulic line length ?)
There are less than 100 mi on this restoration when the hydraulics were added.
Missing something here .....

Thx