hey Sam - fat and protein DEFINITELY slow the absorption of carbs so the square wave bolus is a good idea. sounds like either your IC ratio might need some tweaking (you should even be able to set this by time of day on your pump, like, 1u:10g in the AM, and 1u:15g in the PM) or you need to extend the bolus even more (say, two hours instead of one hour).
everyone is different in this regard, unfortunately, and the only way to really get it right is trial and error.
as far as I know, there is no set formula for, say, x grams of protein = x hours of extended bolus... just know that the higher the protein and/or fat content, the longer your bolus should be spread out.
if you're STILL having postprandial highs, you might want to look into a drug called Symlin - it's helped me, but I'm an endurance athlete and low carb just doesn't work for me.
good luck!
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