With the filters on you need to jet down-I’d definatly run the bike with filters -maybe not the Sand B 's that you have but foam UNI filters that seem to filter more and yet breath better too.Aother alternative would be the larger oval K and N’s ,It’s possible that the smaller ones don’t flow enough but I can’t confirm that as I’ve only used them on bikes with 30mm carbs and they performed well enough.