alehouse, you've read prf's blog - walking is an excellent way to start on your way towards new PBs! Good to hear things are improving.
Second wind. Not sure I understand how or why but the consensus seems to be that it happens when your body finally gets into the groove, no matter how late in the game. In which case aiming for an earlier second wind is better - and good warm up is key. That'll do for good practice.
YD, good restatement of Sod's Law. I'm sure there ought to be a whole lawbook for running, of which that would just be one example.
The Law of Hill Training - When explaining hilly routes on a forum, note that all loops work out to have a non-zero, positive elevation.
The Law of Interval Training - Good intervals are posted to the tenth of a second; decent intervals to the second; poor intervals to nearest ten seconds; other intervals to minutes and always called "cruise intervals".
Duck's Law - The size of the gripe is proportional to the amount by which PB is missed.
Hilly's Law - (A sub-clause of "Preacher's Law") When injured, do as I say, not as I do.
Ratzer's Law - If it hasn't been tested it's not real.
I'm sure there are plenty more. 
Double for me yesterday evening. About eight, followed not too long later by about four. 11-12 is about right for a MLR for me at the moment.