Hmm and you read the whole post of the second link I gave you?
What seems to be the problem? Are you losing the rainbows before you can put them together?
If that is so, you are not being careful enough and checking all the areas before letting go. And matches are being made to mess up your rainbows.
First off, you know by moving a star rainbow piece you don't need to actually have a match to move that row, right? It's called starwalking. Which allows for strategically moved rainbows and trisms to your liking. Which could be one problem.