I finally was able to get the last nest. I used my quicksave tactic which helped.
It seemed as though the nest was spitting out more then one at a time, but I changed my approach rather then head-on came from high up, locked on then immediately did the summon spell and polymorphed and fireballed, and managed one more hit(I needed two more), then got the last one in a similar fashion.
I did use the summon spell thru out this ordeal and it did draw off the m/eaters and I kept moving. After making a hit on the last nest, I backed all the way to the entrance healed and quicksaved, reloaded and got my couple of seconds with no beasties visible.
The disappearing/reappearing nests really got to me though. I used a lower diff setting for this area.
I spent hours here, but finally got thru and finished the game. That 4th nest caused me more trouble then anything else in the whole game and I just about packed it in. Thanks for taking the time to try to help me though. It's appreciated.