According to Jan's Progression Table
http://www.skyjumpers.com/articles/pvprogressiontable.html, both your poles are approximately the same stiffness.
36 13' 175
13'6 165 14' 155 14'6 145 15' 135
Does the 13-6 pole feel slightly heavier or slightly lighter than the 14 footer? I'm guessing lighter, because you stalled out a little with the 14 footer. You need to land further into the pit.
Looking at your vaults with QuickTime, frame by frame ...
On your 13-0 jump, you brushed the bar on your way down but surprisingly, it stayed on. What a lucky bounce!
At this point, hopefully you went to your lighter pole.
You are definitely under, and you're loading the pole before takeoff.
One frame before "thighs together", your pole is already bending.
From there, your body posture is off ... you're leaning back instead of leaning forwards. Many other flaws after that, but they all stem from being under. If you're ALWAYS under (as you say), then you need to lick that problem first. You're probably too "comfortable" being under like that, and you're becoming a drive vaulter (loading the pole before takeoff) rather than a Petrov Model vaulter (free takeoff). The more you delay fixing this "habit", the more difficult it will be to break the habit.
As you know, you hit the bar on your way down. But did you see how close you're landing to the box? Your standards are way too close. Yes, you will hit the bar even more with your standards further back ... and I realize that you had a headwind ... but I'm recommending some major changes to your technique here ... starting with lowering your grip, taking off from further out, and landing further into the pit. Since you went from 5 lefts, then it would follow that you need to do this on a softer pole.
Either that, or just write off this meet as a bad example of how you usually vault, since the wind conditions were so bad. Sometimes that's better than over-analyzing your bad vaults ... just forget about them and focus on your GOOD vaults.
I'm just curious why the officials never moved the pits around if the headwind was so bad?
You actually need a coach standing there helping you with all this. It would be very difficult to coach you on all this by vids only. Do you have a coach that can help you?
On your 13-6 vault, you still didn't land far enough into the pit. Same problem. You weren't under quite so much, but you were still in by at least 9". Your posture was RELATIVELY better than your first vault. I suspect that the more you can get your takeoff out, the better your posture will be on/after takeoff. Work on that!
And remember that if you're going to take off from further back, your going to have to REACH higher on your plant. Stretch (or PRESS or PUNCH) your top hand up as high and as hard as you can. Then when you take off, you'll have really good body posture ... to set up a really powerful downswing ... and with your athleticism, the rest of your vault will be a piece of cake!
And hey, you had another lucky brush over the bar, eh? You hit it with your legs ... AND your chest!
You were really lucky on both those bars!
You already have the strength, speed and coordination to EASILY go a foot higher ... or more ... this year, if you fix your takeoff and other technical flaws.
Good luck!
Kirk