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In my 07 escalade I underdrove the PS via pulley swap, also required serp belt. It firmed it up a bit but not anything like I wanted. I'm on my 3rd 07+ esky and had a number of Burbans since then and have not entertained the modification again. Just living with the over boosted feel which is common.
I'll try and dig for a link to the DIY I had used for this way back then. There were specific part numbers listed within from what I recall.
I like the light steering effort required in my Burb. Why would you want heavy steering in a luxury SUV?