Wiping off thermal paste or keep TP?

My idle temps for my CPU are a bit higher than I like, and I suspect it's because I've used too much thermal paste. (I installed my HSF about 4 months ago)

Can I just take off my CPU HSF and wipe off the excess thermal paste (and maybe reapply a very small amount) or should I just clean off the whole thing and reapply from scratch?

I'm using the Artic Cooling MX-7 Thermal Paste, so I have no idea how hard it will be if I have to clean the entire thing off...
 
I tend to put a very thin layer on my CPU itself, then I put a tiny dot (maybe 1/2 3/4 the size of a rice grain) right in the center of the HSF plate.

Last time I put TP equal to two rice grains on the HSF, and a very thin layer on the CPU, which I think is excessive?
 

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