In all the time we stayed at Compass Point, we never, ever had a problem reaching Kenny to get a slip.
We often did very short term. A day, two days, a week, and did long term at very very reasonable prices.
Nice part of Compass is the Budget Marine, grocery store, etc., and I believe that there is also a car rental there now. I thin it is Zip car Rental as that is where they told us they were moving. And they are GREAT! Reasonable and very accomodating.
pm me if you would like more info.