BUBBLES could be a probem, especially when doing low doses. I use the shor mini NO PINCH UP pen needles, I like them best and less waste as well. I also change my pen needle jsut once a day (less waste). I DO CHECK the prime EVERY TIME, even if only by pressing the end to be sure a droplet forms at the end of the needle.
Once in a while I have a problem with dose, but then again maybe my estimate was a bit off…
First my carb ratio is 1 unit per 10grams of carb and CF is 1:25 or 1 unit of humalog will lower my BS by 25 points. IF I am on the low side I take a unit less of insulin adn if above my range I add a correction factor. I I am low enough I can skip a 1 unit shot and not get too high (usually) and or correct it the next meal. I figure each 10 grams of carbs will raise my BS 20 points (sometimes more), everyone is different so you NEED to know your own sensitivities ratios and CFs.
I have my BASAL set real well so I seldom have a real need for between meal snacks, unless I do phsyical activity. I can go as long as 5 hrs between meals IF my basal is spot on and my carb count/dose are both accurate.
(&( GOMER now that I ahve said what I said I will probable go a little wacky…(punishment?).