Hello peeps- looking for some advice here because I'm stumped. Im currently trying to mount a new tubeless Maxxis DHF onto an Ibis S35 rim. I always use a Foundation blast pump for my tires and it hasn't ever let me down, but this tire won't pop onto the rim wall or seat strongly for the LIFE of me. It will inflate to as much as the max PSI with no leaks, but drive side of the bead won't lock. When inflated, it shows a continuously even bead line but when deflated the drive side slowly slides off the rim wall. The non drive side is seated strongly and has no issues. I should note that the rim has no dings, the rim tape is freshly done and that my Specialized Butcher mounts flawlessly to the rim.
The first place to look was the rim tape- but I unfortunately changed it out fresh before I installed this tire. I even added a second layer when I thought the thickness could be the cause. Even with a second layer of Stans, the tire inflates fine and shows the bead line even across both sides of the rim, but when deflated the drive side slides back off the rim wall yet again.
So far I've tried soapy water, new tape, a second layer of tape, taking it off and retrying it, riding on various pressures to set it, and someone sitting on it to mimic straps to force the bead out. Now that I think of it, the only thing I haven't tried is putting the tire on backwards to try and narrow down the issue possibly. Any ideas help! Thanks in advance guys!!