Opinion on cooling

I just bought a Artic Cooling Freezer 64 Pro and used their MX-1 thermal compound. My cpu temps are at 43c. I've read that this stuff takes awhile(up to 200hrs) to reach its best. Just wondering should I stick with it or try something different(It's only been installed for a couple of days). I had a Thermalright XP-90 and I loved it, but I changed the retention bracket on my mobo and broke it.. I also put it on my vga cooler(sig) and when I first put on the Zalman temps went from 52c idle to 42c idle. Now its up to 44c and nothing has changed in the room I'm in..

just stick with it. I've used it and not noticed any large or discernable differences between it and AS5.