I always put 50% lord's share on my knights. If they don't like it, they can get the f out! I usually award those who dedicate more to the region. Sending them more gold or increase their estate size.
A region with 6 nobles is indeed rare. That is why we are shrinking regions to have more knights per regions.
This is why regions with 4 or 5 knights is rare. Why the hell would you tax at 50%? Use the estate system to distribute gold. If you have to hand all that gold back, skip the bank and look at how your estates are setup. You can change the estate sizes however you'd like.
You not fond of the paper trail?
