new 5boxer needs advices

[shoij]

Hi, I just started doing 4 toons on my box for like 2 weeks or so, and I use keyclone for the job. My team setup is
prot pally,
arcane mage,
elemental shaman
resto shaman.

I have some problems when it comes to healing. I use the 2 posted macros on the pally and I bind the 969 spam macro on the same key with the dps spam macro on the dps. Is there a way to delay the macro such that it gives me some time to build some aggo on the pally? It's the shaman's chain lightning that sometimes pulled aggo and end up getting 1 shot'd by the mobs i pulled. Also, is there a way to heal the target with lowest hp? I dont have mouse cursor broadcast on keyclone i think and current i just bind a key where the resto shaman will cast chain heal on the mage , the elemental shaman will cast chain heal on the resto shaman, and having the mage iceblock. My pally usually gets really low when there's alot of group healing needed / group getting low trying to keep pally up. ( my usual healing is keeping es on the tank and refreshing riptide and casting lhw when needed, and i do it all manually with 3 keys BUT when the group needs healing, i always end up not having es/riptide on tank and just spamming the chain heal button and the lhw button) Please give me some advices on game play ,keys, and addons for improvement.

Also, I am planning to lvl up another toon to fill the last spot. I have been considering a priest/druid to take over healing and respec the resto shaman to elemental, or a warlock / balance druid for dps, or a dk tank with pally healing/dpsing

All advices are welcome, thanks for the help