FDC1-10 Series Proportional Flow Divider/Combiner Cartridge Valve, 0.74 - 2.9 GPM Inlet Flow Range, 50:50 Outlet Ratio

That's actually one of the core jobs this valve handles well. When one cylinder bottoms out before the other, the FDC1-10 sends rephase flow to whichever port is blocked so the lagging cylinder can catch up and bottom out too. The 50:50 split stays consistent even when there's a load difference between the two sides, which is what causes most sync drift in the first place. Just keep your inlet flow between 0.74 and 2.9 GPM to stay within the rated accuracy of plus or minus 10 percent.

Recommended filtration is ISO 4406 Cleanliness Level 18/16/13 or cleaner, so maintaining fluid cleanliness will definitely help keep things running smoothly and prevent issues down the line.