There are more quality top besides Mexican/Spanish brands you might want to try.... They probably won't break quite as easily.
The key to mastering the boomerang with a trompo is to use the correct length of sting. Cometa tops and space tops may not have the right length or thickness to do a consistent boomerang. Other brands like spintastics come with the string at the correct length so you don't have to spend all your time cutting and tying and all that. But in the end you just need to correct the tilt and everything is the same as with a koma (ish).
(By the way, this is my 400th post
)