Step salsa down in size.

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On my A-Cat I am running a 10:1 internal mainsheet cascade with 9mm salsa in order to provide a good hand by the time it gets to me out on the trapeze. The problem is it's a relatively big line bent around smallish blocks. my plan is to replace the standing portion of the salsa with 1/8 amsteel, but am not sure how to go about it.

My first thought is to end for end the salsa into a 8mm dyneema piece, then that into a 6mm piece, and on down to 3mm, but this seems like a lot of discrete steps. Does anyone have a guide for how large each step down can be?