Try 1:1 or 1:2. I don't use much less than this with Dektol which should have the same activity level. Even then it's at the suggested time of 12. Time is less critical than when developing negatives as the density is much greater. With D-19 I had to use 1:1 which was why I stopped using it; it got much more expensive than Dektol.

try jumping up more in times. I would use increments of 10. When you get fog, try backing off half way from the last point. If that is good, bump it forward half way....and so on.

You should get the similar results with PQ. It looks like you are just using a strong enough dilution. In theory you should be able to use any developer. Getting it to work well or with a reasonable cost is another story.