I haven't made this before but I do make quite a few pancakes. Don't over mix your batter. Also if you are making homemade pancake batter I usually make mine the night before.
Do you add extra baking powder or anything? I believe BP will slowly lose potency just not sure how fast
If so, add 10% extra, which is just a pinch for most recipes. Or accept a very slightly lower pancake. (Personally, I like to substitute yeast for overnight recipes.)