If you don't want them to continue on each macro all you need to do is add useless spaces and make the macros slightly different.
/castsequence [target=ToonA] reset=4 Lifebloom, Rejuvention, Lifebloom, Regrowth, Lifebloom
/castsequence [target=ToonB] reset=4 Lifebloom, _Rejuvention, Lifebloom, Regrowth, Lifebloom
/castsequence [target=ToonC] reset=4 Lifebloom, __Rejuvention, Lifebloom, Regrowth, Lifebloom

replace the _ with spaces..html wont take extra spaces to show it

I like keeping them the same though since I use a resto shaman and riptide is on a cd so it won't get stuck on it if I switch to healing a dif toon.