I would go lean on the advancement statistics. You can give that at each CoH.
IMHO, the most important thing a committee needs to know regarding advancement is
how much is being spent on patches and awards.
how many BoRs were completed and thanking MC's who devoted time to this.
how many BoRs might be needed in the coming month.
how many MBCs are fielded by the troop, and which MBs need a counselor in your district.
Try to listen intently to your PLC for ideas they float that may need committee assistance. These could be properties to camp on, special equipment, or a presentation or visit to a workplace or charity. MC's might have "in" on any of these. But if the wish list doesn't reach them, they might never know to offer. So, although gear budgets are very important, the more esoteric wishes are what will hold your committee's attention.
Some other KPI (Key Performance Indicators) you may want to consider
Number of Scouts lost on outings last quarter and actively found
Number of Scouts lost on outings last quarter that you did not look for but who seemed to have turned up anyway
Scouts left at gas / food stops last quarter while driving to or from outings
Number of rain jackets forgotten at last outing with rain (can also be expressed as a percentage)
Number of class A shirts misplace that seem to have magically been found
Number of items "stolen" on an outing last quarter that were "found" in the correct backpack
Amount of trash and debris (needs to be in pounds) left in vehicles used for transit to outings
Amount of clothing and other personal items (needs to be in pounds) left unclaimed after last quarters outings
Number of propane cylinders deemed empty yet seemed to work when actually connected properly to the stove
Number of times troop SPL has explained what the 3 pot cleaning method is (expressed as average times per outing)
Those are all great ideas.
I'd add: Form an adult patrol. Act like a patrol. Make a yell. A flag. Camp apart. Have your own kitchen, just like theirs. Do your menu, just like they do. Have your own grubmaster. Plan your own patrol activities when it's patrol time. Set the example.