A lot of completed GPU tasks but are waiting for validation!

The 'issue' is that some people return their work reasonably quickly whilst others may take the full two weeks.  And, of course, there is a significant number, who (for whatever reason) never return the work at all.  You just need to wait patiently for your 'wingman' (or your replacement wingman - or perhaps your replacement, replacement wingman) to eventually send in a valid result.

If you take any of those tasks you listed and click on the associated workunit ID, you'll be able to see exactly what you are waiting for.  I don't know why you are so stressed about this.  Eventually, every single one will get validated, one way or another :-).  Since you joined in December 05, I would have thought you'd be well used to this by now :-).