You'll never sound like Stevie Ray Vaughan using blues scales. That's because he didn't study or play scales to get his sound. He studied and played licks. There's a big difference.
Many of the licks he played can be captured in 5 simple shapes. They're not scales, just guidelines. This is a shortcut (and it's not for everyone) but if you can't make your scales sound great, you might be working too hard.