Crumpets!

So I made my first foray into crumpet -making today. The Flock tasters have given their stamp of approval, but I am not satisfied. I used this recipe here. I don't know if the recipe is what needs tweaking, due to high altitude, or my technique needs work, but I am not happy with the centers - I think they are not bubbly and firm enough. Also, I would like them with less of a yeasty taste, but that is me being picky. I have a few more variations that I want to try, so we will see how the next batch goes, but for now the Flock is happy...