I'm on my way out the door so this won't be terribly detailed.
1 - slow down. This is obvious.
2 - Have faith; I'm not talking about church here. You need to build trust and faith that the bike will do it. The Sabre will do it. I rode a Sabre for a lot of miles in some pretty hairy riding - keeping up with my sport bike buddies. I can say this from a position of absolute, first-hand experience: the Sabre will handle *any* turn you're likely to find on the roads. The reason I bought the bike is because it's got the best lean angle and ground clearance of any low-seated cruiser out there.
3 - lean INTO the turn to minimize the bike's lean angle and to leave more room for leaning if you have to.
4 - look, look, LOOK thru (or as far thru as possible) the turn
5 - give a little bit of throttle
6 - do *NOT* take your eye off the tiger (or exit point, in this case). Adjust your vision, constantly following your exit point. This is *NOT* the time to go sight-seeing.
7 - did I mention having faith that the bike will do it? Your motorcycle is designed to take turns that would scare the crap out of normal riders. The RIDER is the limiting factor in 99.99999% of all "oh ****" moments.
8 - none of this is a criticism of you at all. We all have these weaknesses to varying degrees. Thus, ongoing rider training. Frankly, practicing in a parking lot without knowing *what* to practice just builds and reinforces bad techniques more often than not.
9 - I strongly, strongly suggest something like http://www.leeparksdesign.com/miscpage_002.asp
. Books are great, but coached instruction is a great way to get pointers on, and put polish and experience on, what the books teach you.