Not a Little Bastard user, but the standard suggestions would be maybe swap out V1 for a 5751, and definitely add more cone area so you're getting more sound without pushing the amp as hard. Typically the appeal of small tube heads is that they *do* break up more easily and at lower perceived volumes, so maybe they're also just not your thing?
Nice picture, by the way, two tasty flavours of British in one bite-size package!
I am Jack's neglected P-Bass|This is your gig, and it's ending one minute at a time|Yeah. Well. Whatever. You can't teach a guitard anything.