When I heal I have started to hold onto Boles more then Balances unless I know that the boss is coming up soon. The reason being that a tank can pull a bigger pull when they got a bole on them, especially an enhanced bole when I got Time Dilation and Celestial Opposition up. Also if they happen to do a much bigger pull then normal I can regen stack, throw a (hopefully) enhanced bole on them and they should be ok.

When I am tanking I try to pay attention to how effective my DPS and healer are on the early pulls, which will be small pulls. If the mobs are dying quick and the healer is spending more time DPSing then healing I will go and start grabbing an extra pack unless the party comp does not lend itself well to AoE. Cause when you got a party comp better suited to single target death then small pulls is more time efficient then large pulls.