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I'm getting a couple of 28mm Pro Ones from @Mu_Mu so these will be my first test on the Light Bicycle U 65mm rim that I have.
What are the IRC fusion X-guards like?
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tough as old boots. I have them on my commutor and they take a long time to wear down. you'll manage it you do alot of miles but it will take you a while as well. Grippy as well and pretty puncture resistant. The punctures I have had in mine (two I think) have both self sealed. Dont use stans hippy, use orange seal or effetto mariposa. Stans cant seal punctures beyond about 50 psi.
90 psi is more than enough for a big tubeless tyre. try 70 psi. I run my 28mm IRC's as low as 50 psi and they feel fine. rode at 30 -40 psi due a puncture that sealed but I then could not be bothered pumping the tyre up till I got home 200 miles later. It was fine and reinflated to 80 psi without bother.
It is not likely to be the tyres fault. I have found a number of rims that are not as tubeless compatible as they should be.
Try a schwalbe or IRC they are about as tight as each other. If those dont stay on then you have no hope. I have decent used schwalbe ones I am not using you could try. I think I have a older set of =IRC fusion X-guards hanging up. not likely to use these now so they are cheap.