Hitachi EX100-3 problem with relief valve

I have an excavator that is giving me fits, maybe someone can help me out.

I have rebuilt the main control valve and the electric solenoid valve block. Put it back in, and I seem to have flow, but my pressure won't come up. All actuators work with a light load, but it doesn't have any hydraulic power. Won't lift itself up, won't dig much, won't track up a hill. Before the rebuild, the machine would lift itself up, dig, etc.

So I put a gauge on the main pump. Every function to relief is...

Hitachi EX100-3 problem with relief valve

Hitachi EX100-3 problem with relief valve