there are a couple neat options here, w/ black iron and cleansing serving as analogues to black knight and crest. if you make the tower shield crystal it has 90 stability which gets pretty ridiculous. something i like is to use eagle and keep a crystal zwei in the righthand slot w/ the estoc mainly for backstab surprises
if you're alright w/ mid-rolling and you'd like to poise-bs people more you can swap chain chest for giant chest and 63 poise