Why in the hell would you torque to 115 ft lbs? You torque to the size of the stud.. You should probably replace your studs if you have been torquing them like that. There is a good chance you will shear them off with a good launch.
Yes I think I explained "Why the hell..." in reply #2. In my world its called "tribal information". That is information taken as factual (whether it be correct or not) from a person regarded as an expert in an area only to find that they have given you bad information that has been handed down over the years.
Did you ever hear the one about the woman who was showing her daughter how to make grandmas extra tender Thanksgiving Day Turkey? On the old ragged recipe card there were directions to cut the right leg off. The daughter asked why. The mother stated "I don't know honey, but that's how grandma did it, so we do it that way". Little did the mom realize that the card had been folded over near the bottom for years until it tore off so it would fit into the grandmas recipe file box. Had she looked in the bottom she would have found the missing portion with the words "...when using the smaller baking pan". Because of this she was providing tribal information to her daughter.
100 ft/lb is the factory specification on lug nut torque from the Ford factory. The lug studs themselves would indicate signs of pulled threads if there was issues to be concerned about. While the aftermarket Racestar lug nuts (made of cheaper grade metal) showed signs of pulled threads when taking them off this last time, the lug nuts used for the street tire rims freely go on and come off with no issue. Now that I have contacted Race Star (I bought the wheels used or I would have known the Race Star spec) and found out only to use 85-95 ft/lb of torque, I know why.
The reason however Racestar can specify a lower torque limit is due to the increased thread count on the shank style lug nut vice the factory style acorn lug nut. The additional thread contact more than makes up for this allowing a lower specification to be applied. This is in accordance with Racestar who I spoke to directly about the matter.
I have no issue sharing my mistakes so others can learn from them. I have learned in life that Pride (aka EGO) is a very dangerous thing when one bases his or her entire life on it. A little pride will go a long way. A lot of pride will get one killed. So I am happy to share my errors of this nature so that younger men and women fortunate to come into this sport far earlier than I did can learn from it and not make the same mistakes themselves. If bruised pride is all I suffer from at the expense of saving a younger man or woman's life because they thought they knew everything but were too prideful to ask, then I have won a lifetime of achievement.
Upgraded ARP studs and McGard lug nuts are in the works as well as some high quality open acorn style lug nuts for the street tires.
Have a great and safe week.