We do, actually. It can be found in client. Full info can be found by decoding datatable_reinforce_accessory_rate.ies
I will not post the whole file, it`s 400 lines for many different types, but +- is this:
<Class ChipCount="1" ChipType="210060" ClassID="455" ClassName="Glove_g46r0" Down="0" Grade="46" Rank="0" Stay="40" Up="60"/>
<Class ChipCount="2" ChipType="210060" ClassID="456" ClassName="Glove_g46r1" Down="5" Grade="46" Rank="1" Stay="40" Up="55"/>
<Class ChipCount="3" ChipType="210060" ClassID="457" ClassName="Glove_g46r2" Down="10" Grade="46" Rank="2" Stay="40" Up="50"/>
<Class ChipCount="4" ChipType="210060" ClassID="458" ClassName="Glove_g46r3" Down="15" Grade="46" Rank="3" Stay="40" Up="45"/>
<Class ChipCount="5" ChipType="210060" ClassID="459" ClassName="Glove_g46r4" Down="20" Grade="46" Rank="4" Stay="40" Up="40"/>
<Class ChipCount="6" ChipType="210060" ClassID="460" ClassName="Glove_g46r5" Down="25" Grade="46" Rank="5" Stay="40" Up="35"/>
<Class ChipCount="7" ChipType="210060" ClassID="461" ClassName="Glove_g46r6" Down="30" Grade="46" Rank="6" Stay="40" Up="30"/>
<Class ChipCount="8" ChipType="210060" ClassID="462" ClassName="Glove_g46r7" Down="35" Grade="46" Rank="7" Stay="40" Up="25"/>
<Class ChipCount="9" ChipType="210060" ClassID="463" ClassName="Glove_g46r8" Down="40" Grade="46" Rank="8" Stay="40" Up="20"/>
<Class ChipCount="10" ChipType="210060" ClassID="464" ClassName="Glove_g46r9" Down="45" Grade="46" Rank="9" Stay="40" Up="15"/>
<Class ChipCount="0" ChipType="210060" ClassID="465" ClassName="Glove_g46r10" Down="0" Grade="46" Rank="10" Stay="100" Up="0"/>
Rank is STARTING enhancement (Rank=0 means you enhance +0 Acc to +1), Up is success chance, Down is chance to -1, Stay = chance to +0 your accessoires.
So for +9 you`ll +10 15 times our of 100, +8 45 times, stay +9 40 times.
IMO - considering higher possible chip income we can keep it as it is. It`s kinda rewarding in terms of emotions to successfully go for +10, while risking only your chips. +-5% is fine ,but no need to totally change it.