My suggestion is to not use /stopcasting at all. Honestly, unless you're casting big heals (aka long cast time heals) or doing content that is hard enough that you're just barely living through it, you will rarely ever see the tank die before the heals go off. This is even more true once you learn the boss fights well enough to expect when damage is going to occur such that you need heals.
The short answer is that you're going to just have to pick one method and try it. There is no "just do these two quick steps and you'll be ezmode healing in 5 minutes" way to heal. Even with the relatively easy setup of repeater regions and click-heal addons, you still must configure your addons for the right heals and find an addon that will sort your team the same on all 5 team members or it won't work like you're expecting. Point being, everything is going to take some work to get any sort of efficiency.
[edit] Just noticed you said level 15. 5 more levels and you get Lesser Healing Wave. That's a fast-casting spell and 4 of those will heal probably 70-80% of a well-geared tank's health. While leveling, it'll usually overheal the tank but it won't waste all the mana that Healing Wave does.
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