Hi all new to the site searching for info. I and a confident taper in Calgary, and have been taping for 14 years only doing custom homes. Now my problem.. I'm being told my finish boxed flats are humped. Now I know how to use a box and adjust it. Blade are frequently replace. They keep putting a straight edge on the joints and say see humped. WTF... They should have a SLIGHT crown to them... NO FLAT perfectly flat is what they pay for..WTF. I have a good contract and am still busy I'm trying hard not the freak out.. I guess I'm looking for some backing or something ammo please.