i would suggest that u dont touch it.. if you want to add stones such as int and str or others be sure its 10% assimilation
18 is fair as soon as you get same or better shield then go play with it... its better to be safe bro dont risk it btw i manage to find myself a better shield than what i have so look what happen
( 64+7 shield ) br 18 went down to 14 when STR stone assimilated it
14
14
10
10
16
10
12
14
14
14
14
10
10
14
14
14
14
14
about 18 stones kinda worth 800k each

i have 12 more tabs here i run out of elements so time to stock up again and play with it once again,
PS: dont loose hope.. that what makes the game cool.. by failures... server must sux hard if all have +9 full OPTIONS SETS ^^