my experience is by no means as extensive as John's or Wayne's but solid footwork, proper lock-off positions and not death-gripping your tools will sway the pump...that and just relaxing, breathing in those stressful sections. Training when not on the ice will help keep what stamina and strength you've gained
I've top-roped climbing with a mountaineering axe and no leash. That sucked. But the pinky rests on the new leashless take quite the load off your need to grip. I will second Alex's notion to look at the last generation BD Vipers and add a Fang if they don't already have one. Best of both worlds and you can find them fairly inexpensive.