This driver? Specs say 2.3A maximum. Tiny bit high for XHP35s imho, but bearable.
On the other hand, just 3A for XHP50s here and there is comparatively low. XHP50 tests show peaks a little above 9A (XHP50.2 J4 3A by djozz, XHP50 J4 1A by Texas Ace) and at 11A (XHP50.2 J4 4000K by Texas Ace) on testbeds. A ≈6.5A driver would allow better squeezing of these big emitters without being over the top… 