Help with ASVSR80 bogs down - hydraulic issue?

Hi -- ASVSR80 track machine - just got a new bushhog mower - low flow MD3 from Skidpro. I do have it hooked up on the correct connectors on my machine.

It seems that unless I really give it the fuel (rpm) the mower doesn't turn very fast and when using the mower and moving the machine the machine is not responding. Like all the hydraulic fuel is going to the mower?
I started off using the little thumb roller to test the mower (it allows me to use the mower but the blades weren't on...

Help with ASVSR80 bogs down - hydraulic issue?

Help with ASVSR80 bogs down - hydraulic issue?