converter lock-up issues

[MIKEY'S 2002 TA]

hi, i am having a issue with my 3600 stall going into lock-up very lazy and soft. it goes into lock-up, but takes its time. the other day i had a chance to get on it a little and i was doing about 80mph. when it went to go into lock-up i was still at about half pedal. the converter shuddered and seemed like it was slipping. as soon as i let off the gas it went into lock-up and seemed to pull alright. is there anything i can do to make it go into lock-up harder and quicker???? would a shift kit help of line pressure adjustments help. any info would be appreciated.
thanks.

[Cutlass]

there are changes you can make in the tune with HPTuners like TCC duty cycle and you can also make changes so it doesn't apply at half throttle.