I thought it was 2.5, but don't quote me on that. Sounds like it's too lean, if it'll run on choke but not off choke.
I'd set it at 1.5 and then back it out until it'll run off choke. May need to hook a battery tender up to it, depending on how long it takes (how many start cycles you need). Also, don't run the starter too much without giving it a 10 minute break to cool off - it's not meant to be used many times in succession.
2016 Vaquero (mostly stock)
2005 VN800B Bobber (Blue Collar Bobbers kits)