I have a bunch of Larry's broadheads and have them mounted on 11/32 aluminum adapters, 11/32 steel adapters, and six are mounted on Larry's titanium adapters.
Terry, you're right - the titanium adapter does go a bit up inside of the ferrel of the broadhead. The result of that, however, is that the external portion of the insert on the end of the shaft of your carbons snugs up nicely just inside of the ferrel. Makes for the slickest transition from ferrel to carbon arrow shaft I've ever seen. Give-em a try!
John