I'm sure I will experiment over the summer and fall. I don't mind the float around our property; it climbs over the logs and roots better and I get a bit more traction climbing the ravine behind the house. We don't do any high speed runs.I ran 11's on all four for a bit, they can be a little floaty through the turns. Nothing you can't get used to but the front end didn't bite like the 9's did. FWIW I found that running a little higher psi in the front helped. It's what I'm doing now with 10's on all four.
I lowered the pressure that much after we rode around the mountains near Leadville and Aspen. Lots of rocks and to high of tire pressure in the stock tires made it a bit punishing. Bigger tires with less pressure feels really good now.
As always, thanks for the advice.
Rob