[What's the best way to exp wk solo?]

Hello guys! As in title, what's the best way to exp wk solo on a6? I've been killing monsters in hg2 since 25C lv to 36C lv. When I reached  36C lv, gained experience drastically fall. I've heard smth about other places with better exp rates, but i'm not sure if i should change previous exp place.

I have wk 99+13+22, some shitty eq with sls 20/11/24/11. I have Aegir with S buff, fibi and all necessary buffs.

Please tell me if i should change place or should i stay? Every other tips you can give me about exp in a6 are welcome

[How "% to damage" works?]

Can somebody explain me how "% to damage" exactly works?