Hi jasonsmith,
Iāve been looking out for sheets that may fit your criteria and found a few over the last few days that may work although Iām not sure if youāve already seen these or the pocket depth is what you are looking for or whether they would match your preference for how they look or feel. It seems that full XL in combination with a cotton/poly blend or 100% polyester and with a thread count higher than 200 (for the blend because polyester microfiber sheets donāt have a thread count) arenāt easy to find
Cotton/Polyester blends:
Polyester/Microfiber
https://www.linenspa.com/products/90g-brushed-microfiber-sheets-by-malouf/full-xl-stone-sheets/ (also on Amazon)
http://www.wayfair.com/Southern-Textiles-Microfiber-Sheet-Set-QH03-LPB1483.html
http://www.us-mattress.com/sts-microfiber-sheet-set.html
Polyester/Satin
http://www.shopbedding.com/luxurious-satin-sheet-set.html
Phoenix