Why the pump truck? Looks to me the trucks could get all the way to the slab.I would have saved the pump truck money if the mixers could get to the slab. 30 years ago I drove a cement mixer for a few years and about the only time we poured in a pump truck was for multiple storys. If the trucks...
Try flipping the polarity on it. I had a lincoln once that you had to flip the polarity one way for fluxcore or the other without flux. It is the two connections in the picture under the tensioner
Being you have so many logs you need to burn what if you bought a band saw for a few grand and saw the logs into boards then sell the lumber and once finished sell the saw. You would probably make some money but either way you would have gotten rid of the logs.