using cooldown buffs with spells

[Jusa]

I use this macro for mine:
#showtooltip Elemental mastery
/cast Elemental Mastery
/stopcasting
/cast Chain Lightning

Works fine.

This shares the cooldown with EM.. so you can't cast CL for 3 mins

I think your wrong, you are probaly thinking this cause the #showtooltip Elemental mastery shows the tooltip for elemental mastery and you see that countdown. And since CL has a 6 second cooldown you press it againand it won't work the second time. so change the macro a little and try this one out.

#showtooltip Chain Lightning
/cast Elemental Mastery
/stopcasting
/cast Chain Lightning

the only diffrence is that you will see the chain lightning cooldown instead of the Elemental Mastery one.

P.S. check the spelling on everything. It's alot easier to just shift click the spells out of your spell book then delete the (rank 1) . one typing error will have you insane trying to figure out a new way to do something that should have worked.