yeah I wish I could clear wider than 2.1 comfortably. The Ikons look great but I would have to run 2.0s (no 2.1 available in 27.5).
I rode with Schwalbe ThunderBurt 27.5 x 2.1 TL Snakeskin. Very similar to the high rated Nanos tread pattern. Fast rolling at 480g and decent cornering knobs. No flats but noticeable punctures that sealed in the NM desert. In Steamboat Springs I swapped to Ardent Race 2.2 120tpi EXO 3C TR. Clearance was very tight but I didn't have any more mud from that point. The swap was not due to the tire wearing out, but that's another story.
Post ride impressions were that a 29" would be a better choice, 2.4 is ideal.