Hi Rotor,
The pool hasn't been specifically tested with BFGMiner but it should work just as well as any other miner. It might not report variable difficulty correctly for Litecoin mining. As long as your hashrate is being reported as expected on your account dashboard, it means all of your shares are being reported correctly. I took a look at the share logs and your miner appears to be handling variable difficulty as expected (it switches automatically between 32 and 64 when needed).
On our
mining setup page we normally recommend use of guiminer (scrypt), cgminer, or reaper (with the stratum mining_proxy for scrypt) -- but 200kh/s is pretty good for a 6750 according to the
Litecoin mining hardware charts, so you may be better off sticking with BFGMiner if it works better for you.