seems you're misunderstanding a important thing, theres no useful way to increase healing output.
You should try find a way to
decrease enemy's damage output.
I dont know what kind of 2dps team you get problem... but the keypoint is survive and poking dps.
Not need to do serious dps with your 2h wep. its very danger and you will die while few cc on your druid.
1.sometimes Cyclone a enemy will work better than spam heal on MSed target. (wound poison, aimed shot)
2.Equip a shield in
Battle stance. You can use Spell Reflect, Shield Bash, Shield Slam while you dpsing. This is really good against Caster dps. Interrupt CC and Reflect harmful spell. Also good against Melee dps, you gain high Armor and Block chance.
So, against Hunter team? is it MM hunt? play be super defensive at start.
Wait for hunter waste mana -> Kill pet -> Serious fight is begin.
Their burst trick is Scatter Shot -> Freezing Shot -> Enemy Healer's CC.
Scatter Shot is instant, so unable to avoid. It mean your druid can't do anything these CC chain.
Skilled warr will intervene when druid get Scatter shot, to eat Freezing trap. but this is difficult.
Simply If Druid get CC, you should runout and cut LoS to hunter quickly. and important thing is "Interrupt next CC."
If their healer is priest, snare it and do not let him reach to your druid to fear.
If their healer is druid, Interrupt Cyclone.
Against DK team... what is their healer class? and what kind of problem you have?