I've got that same kit on my 08. I set it at 2”, I've st my air shocks at 35lbs and I sill get tire rub on my fender riding solo. I'm 6'2” weight 200lbs, so I'm thinking riding two up would rub the piss out of the fender. But since its adjustable I can move it up to 1” if she every rides too.
Btw I think the quality on that set and the way it mounts up is quite good
2008 105th Anniversary Copper Black FLTRI ”Duracell”, lowered, Cyclesmiths black bag extensions, Black Wild Ones 10” apes, Arlen Ness big sucker, Rush slip ons, 12” smoked LRS windshield, blacked out forks, bars, etc