I'm almost as heavy and have run the 28s (measured out to 30 on my wheels) as low as 55F/60R, and at those pressures they barely begin to feel too soft. Almost everyone I've spoken with about their journey into tubeless over-inflates their tires, afraid to make the move to lower pressures.

A tip for settling on pressures for daily riding: with your floor pump handy, start with your normal pressure(s) and let out just a tad. Ride around the block and see how it feels. Let out a bit more, see how that feels. Lather, rinse, repeat, until you get to a point that is clearly too low for your liking. Check to see what the pressure is at that point, then add 1 psi back in and Bob's your uncle.

I'm reasonably certain of two things. One, the end result will be a pressure that is lower, maybe far lower, than you were running previously, and two, given a few miles of riding to adjust, you'll come to love the lower pressure. It seems that one reason some people say that tubeless isn't for them is that they never try the lower pressures that are available.

Sometimes you just have to jump, and the net will appear.