I talked with Carl at TF about this as I was having some issues initially when I put on the BB and extended bumpstops in. I was riding right on the axle plate, but it was during a really cold snap, and it has since changed. He says that typically there is ~.75"-1" of space between the yellow bumpstop and the axle pad, and thats where I settled out to. With Rubi springs on too you should be higher....Did you put the rubber isolater back after you popped in the spacer?
I'll see where I end up after I put my winch on the stock bumper in the next couple of weeks. If anything, I may remove the extended bumpstops.