There's two basic kinds of spiders. Web-spinners that await their food, and hunters that jump it. Hunters don't web and webspinners don't have the same bite. Also, not all can climb so well.
I think that all should have some sort of vision bonus or (maybe) a can't be flanked thing. Much as some worlds have sub races of elves, try sub races here too. The (Hunters) that have a bonus to jump, a bite and an option for a climb speed or a bonus to land speed. 10' for each, I think. The (Spinners) that have a bonus to balance, a web spell-like ability and an option for a climb speed or a bonus to land speed. Again with the 10'. Hunters prefer the ground but Spinners love to dangle from things (lintels, trees... rigging). Cultural differences already. Subcultures too with the climbers and the speedsters. Females normally are dominant, so a matriarchal society is probable.
+2 to Dex., -2 to Cha.?
Just please avoid 'drowness'. Fine for what they are, but jeez.
Keep us posted.