Depending on what rank your modifer is you might have to use a lot of refresh to get the value to go up. Since your crit value is 13 then the modifer rank is 2 which means if you use a refresh stone it will reroll the modifer between 11-15% i believe and since its a 13 you have a 50% chance for the modifer to go up or down if it rerolls a lower value nothing will happen
Thank you that helps a lot!
No problem, also the level and rank of stones have no affect currently. Devs have confirmed
It would say anyway that 'nothing change since current stat is higher' or something like that