| From a very long time Type I and very short time pumper (Animas 2020 -- with extended boluses to prevent stinging): I've been struggling to determine my I:C Ratio as well. I started with 15:1 based on pump book recommendation, and realized that wasn't nearly enough insulin to cover my carbs. I soon decided to start at a too-high dosage, beware hypos, test FREQUENTLY, and adjust as necessary. I began with 9:1, then 9.5:1 (this required intricate adjustments since Animas pump does not have fractional I:C Ratios), then 10:1, and am currently on 11:1. Haven't been on this ratio long enough to know if will need further adjustment. My technique (which may well be frowned-upon) is to establish a "Correct I:C Ratio" when NOT Excercising (to later adjust for ExCarbs). If I find this does not work (based on the fact that different foods / meals have very different effects on BG due to fat content, protein content, glycemic values, and probably numerous other variables), I'm going to use the one that works best for MOST Foods / meals, and then keep up with the amount of adjustment I need to make. Wenever I eat a very large meal, especially with high protein, I take the indicated I:C bolus, treating 50% of the protein as carbs, in Combo fashion -- slight gastropareisis and usually a very large dose that would definately hit me too soon. I also increase my Basal 200% for 4 hrs if a "Lunch-time" meal / and 100% if an evening meal, and retest, particularly at the 4 hr time, to see if I need to extend the Temp Basal Increase. My eve Basal increases from .40 to .60 at 3:00 AM, so I make sure the eve increase does not last beyond 3:00 AM to avoid morning lows. This has been working very well for me. Going through too much detail, and too much personal treatment parameters, but wanted to show how difficult it is to accurately determine the best treatment option for the individual -- no one way works best for everyone, or even for most. Getting back to my original attempts to determine the "Correct I:C Ratio", I've decided that if I don't find a single I:C Ratio that works for all foods / meals, I'll use the one that works best for MOST Foods / Meals and then, if certain foods or meals tend to require a 10%, 15%, or 20% INCREASED Carb Valuation to obtain the correct dosage (I:C Ratio), or certain foods / meals require a 10% to 20% DECREASED Carb Valuation (at least at my current 11.0 I:C Ratio), e.g. input 75 Carbs, vice 90 for my I:C Ratio. This has been working great for me. Much too long a reply to your post, but mainly wanted to suggest possible considerations which may be helpful to you. I should change my user name to "The Analyst", because I tend to Over-Analyze EVERYTHING. Best of luck.  | 
