We have played with several of the new KL130QAP Loaders with the QA Plate. It does effect the roll-back of the bucket due to the extended distance to the roll pins. Not only did KIOTI add the QA Plate, they also gave us a larger / heavier bucket, which we have been requesting for a long time. Now we have both, and the effects of both.
We have found that decent bucket curl can be accomplished by letting down on the boom slightly as you curl in the material pile. The natural tendency is to lift on the boom as you curl. If you let slightly down on the boom as you curl, and continue into the pile, you can get a decent bucket full of material. Takes a little practice, but it works.
Your loader should run at about 2450psi. We wouldn't recommend cranking up the pressure beyond the recommended setting.