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You only tried 4 times? It took me at least 20 times in my living room before I finally got it right!!
I started using a disc wheel to cut the tubing, then using misc. grinding bits on my dremel to chamfer the edges. While this would, occasionally, make a really good flare, most were horrible (the cut wasn't square so the flare tool would get crooked and the whole thing would just bend over).
I finally started making consistently good bubble flares using the following technique:
1) Cut tubing with tubing cutter. Go slow and make sure the section of the tubing you are cutting is straight!
2) Chamfer the ID and OD using a tubing reamer. The one I used is from McMaster-Carr, part number 2709A12. This will make consistant chamfers for repeatable flares.
2.5) (added because of comments) PLACE NUT ON NOW!!!
3) Perform flare. When I attach the tubing holder, I also use a C-Clamp to provide additional clamp-up on the tubing.
4) Remove tool and inspect. It should be pretty close to perfect. If not, repeat.
When I replaced the brake lines on my car (all of them) using this procedure, I only had to do about 12 flares (8 for the car and 4 screw-ups). This is how I learned to make sure the tubing was straight when cutting...
Hope this helps. Flares take time and patience. If you start to get frustrated, walk away, forcing it won't help!
I believe the tool I used was from Sears, and it wasn't all that expensive. The little "nipple" that goes inside the tubing on the die broke off, but if everything is straight and square, you don't really need it.