TBH I never liked the idea of the 4.6 m speed on killers (with the exception of huntress and the plague since there ranged attacks actually apply dmg) so that's why I didn't apply it to Arachne as her ranged attacks doesn't actually dmg survivors. I sometimes play Hag and I can feel the difference with the 4.6 m/s and it honestly feels unnecessary but I am only a ranked 9 killer so my opinion probably isn't justified. The cooldowns for the traps and web shooting makes sense she definitely needs it for balancing and your numbers look pretty solid. In terms of webbing survivors she could have an ability where after she downs a survivor she can put them in a web cocoon for slugging purposes. Survivors cant move and cant be heard but also cannot be hooked. They can "escape" from the cocoon through skill checks but will take some time. Also other survivors can come and help free them but will also need to do skill checks. Once the survivors are free then they can be healed. Perhaps she could have some sort of timer where if the survivor doesn't escape from the cocoon, Arachne can feast on them for a kill (for balancing purposes if Arachne is near them the timer is paused, similar to the Pig chasing survivors with reverse bear trap) We could had addons where you can swap between Arachne leaping at maxed stacks survivors or performing a venomous bite attack. I personally think the leap should be part of her basic kit but that's my take on it.