You mentioned slowing the pace of the rep. For me, in the case of today, doing dips and chins the pace automatically slowed on the last few inches of the ROM and was a down right struggle. I didn't have to change the pace. This told me I was done. Basically got 3/4s of the way thru the rep then it was "uh oh" and squeaked out the last 1/4 kind of thing.