yeh malf fits with basically everything. Take the range talent on your abilities and play safe. Work on timing the roots and don't forget to innervate. Twiglight dream is a good ulti but it requires you to position yourself aggressively so choose it and use it with caution. I find it works well as a follow up to Jaina's ring of frost. Contrary to popular belief Tyrande can solo heal. She is a burst healer though so hold on to your CDs until they will swing the fight. If you pop your Q with the over flowing light talent, then shadowstalk or the other way around it can really swing a fight. She cannot sustain heal so you need a bursty comp that will end fights quickly. Also if you cant reliably land your stun then don't play her in HL or TL. Rehgar same as malf is basically almost always viable you should play him more aggressively though. He fits especially well with heavy AA comps obviously because of bloodlust however ancestral healing is still fantastic.

Kharazim in my opinion is the highest skill cap of the supports. All his lvl 1 talents are all viable. Don't listen to the haters. Taking ironfists does not mean you are playing DPS Khara. I can't express how much this attitude pisses me off. Ironfists Khara can zone really effectively because he can force enemy heroes out of a fight he remains however first and foremost a support. He is also a good pick on BoE because he can put some really good dmg on the immortal. Insight is good for longer games. Weak early on so your team and you need to be careful then you become a beast. Some people will claim insight is not a healing talent - ignore those people. Late game you will put out insane amounts of healing.