You've said it yourself - you're not satisfied with the answers so putting up a bounty is exactly what you should be doing to try to attract better answers that do satisfy you.
If one of the answers does provide a satisfactory answer then you should accept that. If several of the answers provided clues to the ultimate solution, then you should post that yourself (with proper attribution) and self accept. Self acceptance doesn't confer any reputation, but does show other users that your problem is solved to your satisfaction.
It's the way the system is designed and it appears to be working correctly.