Well, I enjoyed the game up until I got to this part. I've tried and I've tried and I've tried and I just can't seem to do it. At this point I'd like to have someone who was able to do it come over to my place personally and see if they can do it, haha. It could be my controller, but I even had worse luck with the retroflag than I do with this Xbox controller. I'm just about to say forget it and go into the fortress levels without it.
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You only really need the uppercut for this. In this game, thankfully, you can dash wall jump simply by holding the dash button like in the zero/zx games, you don't need to press the dash button each time. Once you jump from the ride armor into the first block, try dash jumping away, don't release the dash button, uppercut or double jump, move back into the second block, don't release dash button, then dash jump away and ignore the third block altogether and go straight for the taller wall, uppercut and into the taller wall