I've been using C3 for almost a decade and imo, tempering helps with the texture and minimizing C3's notorious bubbles. As already mentioned, on way to temper is to heat wax to 185* until completely melted. Remove from heat and you can either let completely harden or if you want you use same day, let it cool completely down till it's starting to solidify then bring it back up to 185* till melted, remove, add go and stir. I pour when it starts to cloud. I'm happy using 8.5% fo and don't have seeping issues.
As far as wicking goes, for that size jar try HTP104,105; CDN 14,16; Premier 790.
Hth