Do people with pregnancy fetishes feel sad that the global birthrate is falling?

When boosting attachments what point do you guys usually stop at before starting to use gold chips? Most attachments have 3 slots which can go up to 200%, so 600% total.
Personally I usually try to get around 470-500% before switching to gold chips but that might just be me.

He's my conundrum, I want both Yoohee and Nikketa. I want V1 Yoohee since she'll eventually be good for AK12 dropping, and I want V1 Nikketa right now since hydro is by far my best team. The issue is getting both would probably be around 200 pulls, and I have like 50 saved up right now.
What are the chances that Yoohee will come back for another banner before AK12 drops? Or should I just skip Nikketa for now and focus on getting her and having it be done with?