I have mine set at 16% and seem to boil off more.
My typical 60 min boil is to collect 6.8 gal and I'm lucky to get 5 gal into the carboy(even though I set 5.25 as my collected wort amount). I set trub at 1/2 gal.
I will probably up my boil-off %.
Primary:Black Friday Pale
Bottled: Founder's Breakfast Stout, Preto Branco (Black Orchard clone)
Kegged:Brown, WCIPA, orange cascade, Amber, Vanilla Porter
On Deck: APA, RyeIPA, Kolsch