Well, if after 7-9 years of growth with 2-3 years of loving care and they are not "leaping", I think that you should dig them up this fall and check the roots to see if there are problems that prevent them to grow well. Here are something to consider before you make that drastic move:
Are your peonies getting enough sun? 6hours or more? - too much shade will reduce peony growth
Is the location where they are at subject to prolonged water exposure? - this can cause root rot
Is there any possibility, the roots maybe hitting a big slab of rock under them?
Is there maybe rodent damage (voles or moles eating roots?
What kind of peonies are these? Are they the old fashion Grandma types? Some peonies esp. newer hybrid and species have very particular growing conditions and if these are not met, they fail to thrive.
