I'm not sure about "PROUD" form...any online resources you're aware of? I am a true believer in ChiRunning, as it completely saved my Calves after they completely broke down running "non-Chi" last summer. It's been tough at first to run faster and still maintain the principles, but I have really seen an improvement in post-run soreness.
Pushing past the point of no return is always tough. How'd you feel during the run? Did you feel like you could have gone on? I've been surprised at times when I've pushed myself beyond what my HR would normally dictate I should be running at so it is possible to push beyond what the numbers say. a half might be a bit long to try and intentionally bonk but you never know till you try.
Yeah, I think you should put away the heart rate monitor and just go for the 1:40. Run it by feel and by pace, and let the race-day magic do a little something. When you pay attention too much to your limits (ie., heart rate) then you're just giving yourself another barrier. Just smash through it by focusing on form, breathing and racing on race day. One way to do it is to run the pace for the first six miles. If by the time you reach the half way mark you feel like you can gun it, treat the next half as an LT run. You've done and survived plenty of those!
Good advice guys, and Kenny I have never really loooked at the HR monitor in that light before. I have always viewed it as a tool. I have never worn one during a race. I am so on the fence here, I guess nothing ventured nothing gained. More later.....
That looks like a great training run. As for the little voices - don't forget to listen to the little voice that wants to avoid injury. Sore calves aren't much of a problem but keep yourself tuned in.
I, too, have been trying to shorten my stride and have faster turnover so I go faster. Seems to be working!