I'd really like to match or come close to the Vype Infused Vanilla
Make sure you are looking at the flavor you are trying to replicate/get close to, carefully. I am unfamiliar with Vype products; but, when I search the flavor on line, I see the two following descriptions repeated over and over:
"A blend of sweet and creamy vanilla and caramel tones."
or
"A blend of vanilla with caramel tones."
To me, that means you are
not dealing with
just a vanillia flavor. At minimum; you likely have a vanilla + caramel flavor. And, as much as a sweet cream (or cream + sweetener) + vanilla + caramel. So, what on the surface looks to be simple, can quickly become more complicated.
What you, as someone familiar with the original e-liquid has to decide, is how these flavors are layered. Is it a cream base, with vanilla, and caramel in the background? Or, is it more caramel forward, with a bouquet of vanilla, and only a creamy texture? Or, something else entirely? Only you can describe what your taste buds are expecting.
Going only off the vendor descriptions... I can
guess that it is rather unlikely, that a single vanilla concentrate will provide what you are looking for. I would be more inclined to look at classic vanillas like Madagascar, or Bourbon (both regional references; not booze) for the vanilla note; a caramel; and either a sweet cream, or whipped cream to add a light creaminess to the mix.
I am not really sure what Cinnamon Roll has to do with the original flavor profile

, but that would certainly explain where you are getting the cakiness in your trial batch. And VBIC is certainly a popular dairy note, but may be a bit too assertive for your intended profile (unless you would describe it more as an ice cream/milkshake type of vape.
Again, I am not familiar with Vype, so this is entirely speculation on my part.
Side thought regarding ethyl vanillin:
I find, from my own use; ethyl vanillin is mostly beneficial for providing a boost to the aromatic notes associated with vanilla, and less about perceived taste. Some DIYers find that this can easily become a flavor killer (akin to EM). So, if you choose to experiment, keep percentage low (≤1%). Also like EM, vanillin is often found already present in many vanilla concentrates, so be wary of compounding effects which can lead to muting. Generally speaking; I don't consider adding vanillin, unless I am looking for more vanilla "nose."