Hi magron4, I make scones quite a lot, but I have never made treacle scones.
I don't know if you have made any other types of scone before and been successfu with the others but not the treacle ones (?)
Normally, when making scones, you don't use a rolling pin to roll them out, just use your hands to bring the dough together and pat the dough out into a round shape. When you press your cutter into the dough, the dough should come up to the top of the cutter - that's about the right depth of the scone, any smaller than that and they will turn out like a biscuit. Basically, when you stamp them out, they should look the right height and shape of the scone you want them to be when they are cooked. They don't usually rise or change shape like a cake might. Does this help?