[RedChili]

Although you can sand shims to increase clearance, and I have... I would go with a new proper shim.
Get these:

Product 322 – Desmo Times Ducati 2V-7mm Large Shim – Desmo Times

desmotimes.com

and these (a few to have on hand for the odd chance your removal sends them into the nether world):

Product 312 – 7mm Half Ring – Desmo Times

desmotimes.com

And this (KILLER deal on a quality vernier):

Amazon.com: VINCA Digital Caliper, DCLA-0605 0-6 Inch/150mm, Inch/Millimeter/Fraction Conversion, Stainless Steel, Large LCD Screen : Industrial & Scientific

Buy VINCA Digital Caliper, DCLA-0605 0-6 Inch/150mm, Inch/Millimeter/Fraction Conversion, Stainless Steel, Large LCD Screen: Digital Calipers - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

www.amazon.com

And this (seems a fair price):

Product 66a – Digital Micrometer for Measuring Shims – Desmo Times

desmotimes.com

And this (unbeatable price):

Crankshaft Turning Tool for 1990-2020 Ducati 1098 1198 1199 1299 848 Hypermotard | eBay

Features: 1. FITMENT: Fits all DUCATI Series from 1990 to current. Includes Ducati 1098 / 1198 / 1299, 1199 Panigale, all Multistrada / Diavel / Streetfighter / Hypermotard. 2. FUNCTION: This tool allows you to safely rotate your engine while checking valve clearances or setting the timing. 3...

www.ebay.com

And download a guitar tuning app for your cell phone, to set belt tension at 110Hz.