The search for the perfect indicator is one of those eternal quests I think. I've tried pretty much all of them and had the same disappointments with the Thingamabobber that had originally seemed so promising. The most ideal solution for me has been the Float Master as mentioned previously. They're not as broadly distributed as a lot of the others, but you can order them online from plenty of places. They're as close to perfect as anything I've found so far.