Welcome, from New York, to The Greatest Forum on The Internet!
I also have The Andrews 57H in My 2012 Custom along with Smith Brothers Adjustable Pushrods and love how My Glide Runs.
I was going to install a .030 Cometic Head Gasket, for a compression bump, but haven't gotten around to it yet.
Best of Luck on Your Search.
Andrews 48 would be perfect for you if you're wanting more torque without head work. It doesn't make quite the numbers the 57 does or pull out as far in upper rpm's, but it will come on lower in the rpm range and do it without going with a thinner head gasket like the 57 likes.
Welcome to the tank, from Idaho! As MANY have mentioned, the Andrews 57 is a very popular choice. Also check out options from Cyclerama, as I believe you can run their 570-2 as a bolt in with adjustable push rods.
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'15 FLTRXS - V&H Power Duals w/ Screamin' Eagle Street Cannons - Arlen Ness Big Sucker - BT4180.14 w/Arc Moto 602v2 and Polk MM652 - Le Pera Maverick Daddy Long Legs - Advan Lowers - Freedom Shield 15"