Just for completness sake here are my heals with my myth proc running (+50% Wis +spell/heal).
In raids I mainly use my ward every time its up and my group heal after every AoE hits (which has +30% more chance to crit than displayed on my UI). Our group heal pwns face tbh; and I miss it most when I'm in my AoE/DPS/Instance spec such as gynok.
My complete MT spec if interested :
link
We can talk about tweaks to the dps/ spec till the cows come home but imho this is the best spec for me I have found for my MT spec. my only regret is not enough points to put into the ward recast choosing my increase casting speed on group heal and single to deal with damage spikes better instead.