distributer cap mods?

Just a thought here...is your torque wrench working properly?
As in calibration?
If you have beam type wrench, probably no problem.
However if you have a click-stop torque wrench, it could be off as the spring in those types of wrenches loose there strength and torque readings will be off.
It happened to me and caused an AIR LEAK on my wife's 3.5L Chrysler V6.

Just a thought!

cudamike13