Well, your voltage readings aren't that bad. You are close to being 5% off on the 12v rail, but I wouldn't say your PSU is failing according to that reading. Tough call really. Your system doesn't seem to be all that demanding (hard to say as you haven't posted your system specs) so your PSU may actually be enough for your system. It is low on the amps (12v rail) and you are almost maxing it out if you calculated 207watts.
If you have access to another PSU (friend's system) you can use to test, I'd say that's your first priority. Regardless if whether or not this is your problem, if you have $40 or so to spare, you should seriously consider getting a new psu.
http://www.newegg.com/Product/Product.asp?Item=N82E16817104952
If you buy that PSU, the worse case scenario would be that it doesn't fix your problem, but you have a high quality PSU in your case. Low quality PSUs are the top cause of system problems. You'd be ruling that out as a possibility in the future.
Best case scenario, your system problems are solved for under $40.
(Note: before buying that PSU, you should probably post your system specs. Specifically motherboard make/model and whether or not your current PSU is ATX or microATX. If your system is a pre-build like a Dell or something, you may not be able to use that psu I have recommended, as Dell etc., tend to use proprietary parts).
