Timber, did you ever try to scrape small layers off, working from a flat ground ? That's how i find my loader on the Zetor 5245 works best, with the 2 meter bucket. Probably HST gives you more control of wheelspin, not digging up everything by taking the pedal back to give the front loader a break, so it can lift the bucket a bit before you continue pushing.
I allways try to scrape off a layer thin enough so that my wheels dont spin, so i get max. grip working from flat ground.
Is there a noticable difference of bucket with teeth, vs. without teeth ? I am thinking of welding some leaf springs on my bucket, at the company i work, we also do full air suspension conversions to light commercial vehicles so we've got lots of leaf springs to scrap... spring steel is allmost as wear resistant as manganese. Just for me, old leaf springs are allmost free !