It looks like you already figured it out, but we actually tried SoS rit first and the dps just isn't as good (plus it's hard to get spirits to target the right stuff). Sliver also doesn't work because of enchantment removal at the towers.
Haha sucks to lose it after all that time figuring out tactics, but tbh I should've realized that prep shot would be a much better skill. Nice job on the 5!