Lol , today i checked rates and what i saw ? there is 1% chance for +10 :O
Here are the rates
weapons :
+1 90%
+2 80%
+3 70%
+4 55%
+5 40%
+6 25%
+7 15%
+8 10%
+9 5%
armors :
+1 95%
+2 85%
+3 75%
+4 60%
+5 45%
+6 30%
+7 20%
+8 15%
+9 10%
without any talismans