Let's figure out ability scores.
Similar symbionts have...
Crawling Gauntlet: Str 6, Dex 18, Con 11, Int 5, Wis 8, Cha 10, Ego 3
Handlinger: Str 6, Dex 16, Con 12, Int 16, Wis 12, Cha 15, Ego 19
Psionic Sinew: Str 14, Dex 3, Con 13, Int 6, Wis 8, Cha 11, Ego 6
We're given an Int of 8-10.
How about Str 6, Dex 16, Con 13, Int 10, Wis 10, Cha 12, Ego (to be determined based on symbiont formula)?