Doug, I ride both a 54 SM and a 57 Roadeo. I have nearly the same PBH and SH as you. You can drop the bars about 2 inches below your saddle if that's where you want them, maybe a little less on the SM due to the relatively long/high HT. The sky is the limit as far height above the saddle using a Tallux stem. Both of my bikes are set up with identical cockpits with my saddle level with the bars. I do use 1 cm smaller stem on my SM on account of the "expanded frame." Hope this helps.
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