310a Hydraulics slow & weak – need good mechanic

1979 JD 310a. Slow and very weak backhoe...front loader just seems slow, could be weak but I don't know any better. Steering seems fine. Picked up the machine a few months ago from father in law...he is an old farmer type who would rig anything he could and forget about it....thought it would be a fun project.....oops. I have changed all the fluids, filters (both) and sump screen (it was very dirty), most of the hoses replaced too. I had the cylinders rebuilt locally and they don't leak anymore but are still weak. The backhoe control valves leak a good bit (maybe 1 quart every 8-10 hours of digging use). The destroke solenoid on the side of hydraulic pump is missing the wires...might get a new manual type from JD to check that....beyond that I need to get a gauge from what I can see. Does anyone know a good mechanic around the Tyler Texas area? Don't say Doggett...I had them out to look at a very specific issue, explained the part I wanted removed very carefully to the shop manager...the tech showed up the next day without the special tool. Then they hit me with a $400 bill after I sent the tech away with nothing being done. Sorry...fool me once shame on me...fool me twice and...well that wont happen. Just need to find a good local repair place for this old backhoe. I have a trailer and can haul the machine locally. Anyone heard of Christian Tractor? I called him and he said he was 2-3weeks out before he could look at the machine. They seem to work on everything....not sure if anyone specializes in these old machines around here. Many thanks in advance!