Just to clarify a few things here, which I hope doesn't come across as rude:
Jump 14 on _tpn are not speedshots, but rather "skips". Speedshots involve touching the ground briefly and are usually done from surfaces you can land on safely (you will have done one if you've got to jump 14 on tpn). McMaster's advice #1 was for speedshots (though it kind of applies to skips too). Here's my advice:
1. The key with skips in most cases is to get a really great first jump so that you skim the first skip platform. From there, you will gain the best possible speed when you fire your rocket. If you want pure speed, aim straight down or thereabouts - that way, when the rocket actually hits you it will be behind you, propelling you quickly forward but also starting your descent. If you need height, you'll need to aim forward slightly - the amount you need to aim forward will depend on how much height you want to gain from your skip.
2. Speed pogo follows similar rules (well, we should say that skips inherit the rules of pogo). On a flat surface, the most speed you have the more you will need to aim up/forward. Aiming even further up than required can be used to gain some additional height, usually used when transitioning to a wall climb or similar (
example). Other ways to deal with high speeds involve tapping "s" to keep things under control, or using slight pre-fires.
3. If you're coming in from a really dodgy angle and don't think you can time your sync from memory, try to look at the rocket to line it up. The height of your sync will depend on how accurate you are with timing, your sync rocket aiming accuracy and your final rocket aiming. If you're firing your sync from an angle, you may find you are aiming that rocket too far in front or behind of you. Usually you want it close to your feet. From there, the type of rocket jump you do from the ground will have an impact too... For maximum height jump straight up.
As a general note, many players have developed a "flick" motion for pogos and skips... I know I have. This motion is not necessary, but for whatever reason it can seem to help - and has the advantage that you can better see where you are going. Try flicking up after pogo shots and see how it feels. In the example I linked you can see that motion too.
(
Some Skips,
Prefire pogo to keep height)