Are you male or female?
It's definately possible that weak hamstrings are contributing to knee pain, especially if you've increased the strength differential between the hamstrings and quads.
Are you in PT now? If so, why not?
There are tons of hamstring exercises you can do: RDLs, SLDLs, single leg DLs, leg curls, glute-ham raises (sounds like you found this one already, it's a fun one), etc.
Anyways, get into PT if dislocations are a problem. And don't be afraid to ask the PT about their experience, education, etc. And do try to find a clinic where you'll actually be with a PT and not an exercise tech.
<------------------ Not an MD.