Probably not relevant but..when you pump up the tyres, just put a little air in at first and then rotate them if you need to, so the valve lines up well before pumping. If using those evil threaded ones then do not tighten the collar much until everything pumped up. And even then I just nip them up.Also check the valves holes for sharp edges, or bare metal exposed, and that rim tape is present.
If you like the tyres it may be an option to get some larger width freeride tubes or lightish dh tubes ( not too big though )? They’re likely to be thicker rubber and a larger diameter and may grip the tyre better.