Need some help dipping into the 11's
If you are having your ETs change from round to round and you are having 60ft times ranging from 1.67 to 1.75 then you have a traction issue. I agree with a 112 MPH trap speed being more then enough to produce a 11.99 time slip. You are going to have to get the 60 foot down to mid-high 1.5x to get an 11.
If your power is maxed out, then get a GOOD converter 8"-9.5".
If you don't think the power is maxed out then you need to start at the beginning and tweak the timing until you get it perfect, then play with the carb to maximize MPH. (and then get a GOOD converter match to your engine combination)