Clean it up to prevent bar slip
I used the ITM Millennium combo for 3 years, and when I first installed them I had bar slippage when I hit a big bump while on the hoods. I think I was scared to over-tighten the bolts. To be safe, be sure to do the following: 1) Clean the stem contact area and cap contact area, as well as the bar clamp area free of grease - I used isopropyl alcohol. 2) Lube the stem cap bolts, on the threads and on both sides of the washer at the bolt head. This will help prevent any galling in the threads and allow the bolts to be snugged up.
FWIW, I had the bars on and off several times over 3 seasons for travel purposes and I had no problems. I never used a torque wrench, just a 4" long 4mm allen wrench (Bondhus) and my "feel".