I'm not sure there are any specific guidelines on that. I think that the first 3-4 cycles may still be influenced by the depot of the larger dose. So in theory the depot might have be exerting an influence on this mornings cycle, but it is starting to get marginal.
I know a couple of times in a similar situation folk pointed out that you need to be mindful of a kitty racing down the dosing scale, BFG didn't do that (he never races anywhere LOL), but if you remember BK's graph that Sandy posted once for you, you know that sometimes the reductions can come fast and furious.
You didn't need the big guns this morning, and he seemed to surf nicely, so it doesn't seem like he was ready for it this morning, but you are in a better position to judge that. I think that you know Bubba well enough to know when he is asking for that reduction let your spidey senses guide you

. It might not be long before he lets you know for sure.
Paws crossed for another great cycle tonight, think green Bubba

