I think a 1/2 round piece of wire, protecting the tail blade from underneath. No need to put one on the top 180.

But, that will make your heli even more tail heavy. Some have taken to trimming the tail boom some, just dont make it to short that the main blades and tail blades could wack each other.

Try to get balance by moving the battery as far forward as possible. It its still tail heavy, then yes, the slightest amount of weight in the front. Not to much, dont want to make the bird a pig.

Michael