You dropped the 3H+KP466P+K string a couple times in the first three matches, though you were consistent in the last one against Honoka. And yes, 43P is also a sit down stun, but 214P guarantees much more stuff and is +1 on block, making the better option. 214P is arguably one of Akira's best tools. 43P is faster, but it really only guarantees the 666P launch, though it has other uses such as it being a force-tech after the SPOD or can be used in some combos such as 46P --> 43P --> 2P-->3H+KP466P+K (light and mid-weights). For an illustration of what you can do with 214P, check here: www.freestepdodge.com/media/akira-214p-guaranteed-stuff.9365/media
Good stuff man. Keep it up. Yeah, definitely tone down the 6KP since it can get you killed. You might also want to practice with his 3H+KP466P+K string more since I saw you dropped it a couple times. Also, you should add 214P to your arsenal since it's his best sit-down stun that can net him 90-100 guaranteed damage.