That is the beauty of the Yihi SX350J chip. You can build all the way down to .05. My lowest build was about .057 on the Kangertech Mini and it worked just fine on the SXM. You can't do that on the DNA40.Nicely done. I couldn't even get 24g 2.5mm ID to fit last night, spent a half hour trying to get the barrel on the build deck without shorting. I was using 9 wrap spaced coils, so that could have been part of it.
Reason why I said 30g for ni200 would be the amount of wraps required to get the resistance high enough on a 2mm bit, but perhaps with 2.5mm 28g may work on a yihi device. Would still probably need 30g for a dna40.