Bob, I've got the same machine & loader. I initially thought my FEL wouldn't lift the tires off the ground too, but on occasion the tires did lift up.
Seems you have to invert the bucket (open section on the ground) then raise it up. Down pressure with the bucket in the normal position doesn't seem to raise the front end. Although my neighbor has a 1999 Kubota L35 TLB and he CAN raise it quite easily in the "normal" position.
Any idea which port on the loader is the PB port. Nelson Long told me to connect the PB hose to the T port on his electric hydraulic valve kit and we think it's the one that goes to the neutral port on the tractor.