With kuki, I've never gotten a bad brew. I just loosely follow sencha parameters, but go a little hotter with the water.
Say... ~178°F for 1.5 minutes, then 40s, 60s.
That never leads me astray, but I don't drink much kuki either. I've only ever had 3 types.
By the way, if you're enjoying the tastes of twig tea, you have GOT to try out Hibiki-an's Karigane Sencha(which is their kukicha, in which they use gyokuro stems instead of sencha stems!). That stuff is a whole 'nother brew!