Hi,
I replied to your PM but i wanna post my reply here also to avoid future confusion of mining diff setup.

1. Your mining diff has ZERO  I repeat  ZERO  impact on your chances for finding a block. What is does it tells your miner which shares to send to the pool and has a little impact on your speed stats. So in all three cases you are good to go - diff around 27887  auto adjusted by the pool, Manually 65536 or with slush proxy - 8000000
It is up to you to decide
The important part is that your diff should be lower than DOGE network diff not to loose a doge block which equals to 2336512.132*65536 > 8000000 as we speak
Best
Loshia