I recently bought F2-6400CL4D-2GBPK
Right now it runs at stock 800MHz, 1.9V,
timings 4-4-4-4-2-30-3-9-6-9.

It's memtest86+ stable and 24/7 folding stable. Is it safe to run memory at such timings?
I got a nice bump in memory benchmarks @ Everest, so I would prefer to keep these timings over suggested 4-4-4-12-4-42-3-11-7-13.

By the way what's the lowest possible timings on these sticks? Could it go even lower? I am a bit scared to try it myself.