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The best way to figure out things like this is to look for examples that already do what you want. However, for size, there isn't a lot in the game that changes it; there aren't any feats (for example) that add 1 to your size.
One way to get some information about a thing is to right-click on it, and select "Show Debug Tasks". Try that for the Size trait, for example - you'll see a list of the scripts that run on it. The fourth script, running at "Setup/4000", is called "Size final".
This implies that the size has to be "final" (i.e. no more changes made) before the phase/priority "Setup/4000". So try running your script to change size at a priority of "Setup/1000" or so - that should be early enough to change the size, but still late enough that you know what level the hero is.
Hope this helps!
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