A program like MemTurbo will help your RAM usage (there are many places you can get a copy).
There are a lot of Xolox users ready to try the new Xolox 1.13, whenever it will be available (I hope all of the minor annoyances will be fixed).
Also, it is not recommended that you leave searches running for more than 2 hours (even though I often leave mine on over night too).
Xolox is still my favorite share utility, despite a few manageable problems.