As you go through the VCDX process, you will get a lot of feedback from your study group and the VCDX mentors you have mock sessions with. That feedback is a gift, you need it to evolve and grow the skills to be successful as a VCDX and an Architect. The trick is to take that feedback and incorporate it into your style of talking and presenting and make it yours. This includes filtering that advice and discovering what is best for you and what is not. I think of it as finding your “Voice”, the thing that makes you unique and is at the core of your identity as a person. And we are all different, what works for me, may not work for you.
Finding your voice takes time and effort. And making major changes to how you do things at one time should be avoided. You want to improve your game one step at a time. If a minor change works, keep it, if not, discard it and then move onto the next improvement.
During the mocks I was involved with in the past month, one of the candidates was asking me about how much information to share during the defense to reduce the “attack surface”. On this subject I have changed my mind over the years. My current thinking: if you know a particular subject or technology in-depth, you should talk about it and showcase your knowledge to the VCDX panel. Let them ask all the questions they want and if you do not know, then say so; you are there to demonstrate your skills and knowledge. For me personally, I have always found the process of “stepping around” certain subjects interrupts and impedes my flow, so it is better to just go for it and let the chips fall where they may.