Originally Posted by
Carbonfiberboy
With a number like that, I advise backing it off and not doing so much hill work. Just ride and don't worry about it. Getting your body converted over to a cycling machine is a slow process. I've heard 7 years for complete adaptation, and I think that's probably about right. On the good side, that means that you'll keep getting better and faster for at least 7 years, which is nice to look forward to. Your VAT will come up no matter what you do as long as you're riding lots. You have a lot of base work to do. You'll know when you're ready for hills, and if you keep doing 150+ miles/week, you'll make good progress.
Personally I'm incredulous that the person reporting this actually had a VAT of 114 BPM. (Unless he's over 70 years old?)
To the OP: your power to weight and your gears are barely enough to spin up this hill at ~70 rpm. It is quite normal to experience signs of failure as described in this situation. Your best options are to get a 12-32 cassette and to lose weight.