A bigger dish certainly wouldn't hurt , Intelsat 3R at 43.0°W - LyngSat Maps
Your dish size could definitely be part of the problem.
I hate to spoil your wishes but the Italian Mux from Challenger has been somewhat abandoned for months, Lyngsat list has not been updated to reflect that several channels have changed or dissappeared , channels Include Dr. Dish and a couple of Italian channels that have only audio or are pitch black (what's up with the maintenance) , anyways there are still a few Italian channels but not as good as what was there last year.
Coolsat 5000 - 90 cm Fortec Dish - Stab HH-100 -Snh-031 Universal Lnb.
Future C-band 10 ft Paraclipse -