Try to spend unconfirmed output with higher fee , it may work.
No, that does not work. I tried that with another site, still is unconfirmed. I just don't see the issue with doing the standard .0001 at least...like the .00005 more is going to break their profits.
0.00005 works for us so far. But yes, we're looking to increase it to improve with even better confirmation time. And I believe your withdraw should gone through (at 1-2 hours max).