Mel,
I was wondering whether you were using the Lehmann recipe. But I have not experienced over-elasticity. Usually, it is over-extensibility that is the problem (not a serious one, though). Since I posted that original recipe, I have gone to a 63% hydration for the Lehmann recipe. You might want to try the newer recipe, which is posted at Reply #86 at the Lehmann thread, at
http://www.pizzamaking.com/forum/index.php/topic,576.80.html. Usually, elasticity diminishes with time. But if the dough isn't warm enough before shaping, it can also be a bit harder to shape without resistance.
In the meantime, if your dough is ever too elastic but has otherwise warmed up enough to where you should be able to shape it, just let it rest on the counter for a few minutes and then pick up where you left off. Sometimes you may need to do this two or three times to get the gluten to relax enough to where you can shape and form it. But one thing you don't want to do with a dough like the Lehmann dough is to reball it just before you start to shape it. The dough will tighten up so much that it will take a long time to get it back to where you can shape it.
Peter