luckily the two non gear farm I'm doing are there all the time. Young han solo and mod slicing material. The young han shards i just buy every now and then. No hurry currently. I do probably buy 5 or so for every raid though.
And the mod slicing material, i buy when I'm close to the other components being ready but also no set pattern. With 3 raids and other sources it's pretty easy to get 20 by the time I need them.
Also, you eventually reach a point where the gear in there isn't as hard to pass. I only have a few characters that I'm actively working on that need furnaces. And carbontis are always good but i can get enough of them from challenges to keep up with the amount of stun guns I get. And most of the characters I'm currently gearing need both. Most of the gear I need is in the guild events store. Luckily I have hoda 7 star and am not to worried about wampa yet so i pretty much exclusively buy gear from there.