Welcome aboard, John, and congratulations on finally getting yourself a Monster - you've tried the rest, now ride the best!
Way back in the dim and distant, Ducati themselves used to offer a jet kit in their Ducati Performance catalogue. It was made by Dynojet with the part no. 08062 then 96413497B.
It's no longer available from Ducati but the Dynojet branded version can still be found. You'd want a stage 2 kit, Dynojet no. E7206 e.g.
https://www.officine08.com/p13696_ca...t-stage-2.html
https://www.ebay.co.uk/itm/E7206-Car...0/202598732077
