Every once in a while my miners will go through a phase where a lot of DLs go unconfirmed normally all I have to do is reset my mining program so if it happens again just try restarting your mining program 90% of the time that fixes the issue for me
@haitch Think I might just see how it goes and use the optimiser after if it isn't working out. I'm planning on a new system anyway which may keep things tight as is.