I disagree. The spear is fine the way it is. I've used LK for a while now and it's perfectly fine.
If you want more str try str food/items or slap on a scarf instead of a SGW/RAW/Ruck. If you want more sp, again, use stat food or I highly suggest using hollowring cards. With two hollows my LK's sp goes from 3xx to 900-1k. You can use different cloak card combinations such as Hollow/hollow, Hollow/Skoll, Hollow,Raydric. The LK is gifted with enough hp to still tank while using a hollow in your cloak. Dispel is completely unnecessary and would make LK vs Champ even more imbalanced. If you want dispel sacrifice one of your weapon card slots for Valk R, your damage will still be good and you'll be dispelling a good bit. The after cast delay is also not a good idea as the best way to combat a LK (in my opinion) is to force different head gear card combinations. Using puppetring and assassin cross card to cloak you can force him to switch around headgears (maya p, fsoldier, kiels) in some way he has to sacrifice something... this gives you a way to build a strategic advantage in a 1v1 duel. Giving him a cast delay reduction from the weapon would kill some strategic play against the class.
I don't have time to reply to the rest of your suggestions but this one stuck out to me and I have played LK a good bit. I might reply to the others later.