performance question

[rageingbull]

I have 03 6.0 Duelie 4:10 gears 1/8 mile speeds:
Bone stock --62mph exhaust & intake 65-66 mph-- sct eco tune from dj 70-72 mph --then a mild street (70hp) 80 mph but now a 90hp street and went down to 76mph but just 1 run why?? it is hotter here now then when i ran the 80mph but not like blistering hot I am
not launching just putting foot to floor i get out about 10 feet and spin a little --more in the 70hp mode then 90 hp what do you guys think - somethin wrong I have a 1/8 mile market on a private road thanks