I think cybran acu getting nano is a bit odd, just doesnt quite suit it. 20 H/s regen on a base acu is also pretty crazy, for 5km 1v1 especially. Additionally, im pretty sure vet scales multiplicitavely, and the first level adds roughly 50%, meaning just one vet would put it near 30 H/s. Add stealth, and it'll regen 50. This is almost on par with the uef nano, for a lower cost, and added stealth.
These number are not entirely correct (uef vet brings regen 10->15, cyb vet brings regen 15->21, not quite 50%) so im not sure this'll be the case, it's just something im worried about happening. If someone knows more on how vet/base regen scaling works, i'd love to hear