Based on what you write about your skill, I think you will adjust to a smaller board MUCH easier than you might think. In fact, I think you could even go smaller than the 102. A lot of things will actually get much easier on a smaller board. But this depends a lot on what sail sizes you will be using.
A Kode is still a board that is easy to ride. And as long as you're reasonably powered up with say a 5.7 or smaller, I predict that you will find even a sub 100l Kode stable enough. But maybe 102 is a good safe compromise.
And if you eventually see yourself as more of a wave/maneuver oriented sailor (rather than a blasting oriented one) I think it makes sense to get used to this type of board as fast as possible.