Yeah.  Need more info. 

However, cgminer is very good at detecting multiple gpus and setting the best options for them automatically.  You could try that.

You should get about 370 MHs @ 900 Mhz.  The fastest fix might be to try another OC application.  Trixx is probably your next best bet.  Also, clocktweak is worth a look.

What software are you using to OC?

I hope so.  I've been running mine at 100% for about a month now.

All 6950s

Closed rigs seem to be between 75-85C
Open rigs are generally between 55-70C

I don't see the advantage of solo mining.  The math works out over a long enough period of time.  Sure, you'll make less BTC per block, but you'll be getting blocks more often.  So it's a wash (over enough time).  But most people like to see a steady income of BTC which is why pools are around.

If it helps, i'm using logmein with no issues, so it's likely not part of your issue.

Free windows doesn't exist unless you steal it.  Try linux.  It's nice and free.

The wiki is good.  This forum also has many great resources.  Here is a comparison of gpus that is handy: http://bitcointalk.org/index.php?topic=9674.0.

Agreed.  You're like mining on the same card twice.  If you're using guiminer, check the dropdown under each worker and be sure they all point to separate gpus.

Not worth it.  No.

I would try lowering the clocks.  Are you monitoring temps?

Sounds like a PSU problem to me.  But you might give another mining app a try.  I used guiminer initially, but have since switched to cgminer. 

Yes.  Clocktweak is very cmd line friendly.

I've had similar issues.  You should try clocktweak.  It's functions well with multiple gpus. 

Which driver are you using?  Some of the previous AMD drivers loaded up the CPU with work for no reason. 

Prop is great when you get quick blocks, but it will only take a very long block or two to make you wonder why you didn't switch to PPS.  Also, PPS doesn't have the hopper issue of your share of short rounds going down.  Currently, you need medium sized blocks so that you can reclaim your share after the hoppers leave.  In PPS, it doesn't matter.

Also, there are many variants and combinations of these two types.  The pool that I currently mine in uses PPLNS, which I like quite a lot.  You should explore some of the other types as well.  There are quite a few.

More likely than you'd expect.  Rumors of blocks being invalid after 20 blocks is not unheard of.

Thx Rennex.  Concise and helpful. 

Most apps will have an "other" option.  Select that and enter your server details.