I agree with Jake, I would struggle to get something really great from a decaf bean. I find a good decaf is passable in milk, but very difficult to get something great from them as espresso.
If you’re trying to reduce your caffeine intake and don’t want to go to a fully caffeinated roast, why not start with a 50:50 blend of decaf and caffeinated coffee? It won’t be quite as forgiving as a fully caffeinated cup, but it should give you a little more to work with.
Decent DE1 • Mazzer Philos