Congrats and welcome to the Ape Hangers Club. I went that route years back for neck and shoulder relief. Only went 12", but what a difference. I didn't install heated grips though. Sometimes think maybe 13" or 14" would have been better, but hands nearly level with shoulders and and a good 2" above the fairing. This causes additional cold to the hands in winter and hot sticky bugs in summer, but I'll never go back to anything lower.
