Linkbelt/Case/JCB/Sumi I need hydrualic help!

I have a hydraulic gnome eating my lunch!
Let me start by saying I have 4500 psi from both pumps, and black smoke when it stalls the engine. The machine is a '96 3400Q link-belt with some particular hydraulic issues that i cannot find to save my life.
I have been focusing on the bucket issue since its the biggest nuisance, but ill mention all the issues since they might be related.

Bucket In/Out bogs engine excessively.
Boom up is not receiving dual pump flow.
Right track is...

Linkbelt/Case/JCB/Sumi I need hydrualic help!

Linkbelt/Case/JCB/Sumi I need hydrualic help!