@Basharat : T3113 is nothing but first paging response timer that you have set as 7 , set it to 8, also check for Call set up time.
Anyway, you might be checking from BSS, both this & implicit detach timer are MSC timers , ask MSC guy to help you out.
Try these settings after consulting
TX Int. : 12, MFRMS :5 (If traffic is high, 3 if its low), AGBLK : 1. Cant comment further, share reports if possible, I need to have an idea of traffic & LAC dimensioning.