As per the title, Zylok's Tier 2 evolution, Precision's Payoff seems to reset when you reload the weapon (or change to incarnon mode)
The evolution reads "On burst headshots: Increase damage by +20. Stacks up to 3x"
There's no mention of it resetting if you reload, so seems clearly bugged or the description is wrong.
As per the title. I know that there was a problem where warframe native weapons had no mods, so I assume it's the same thing with Venari. As is, if you get Khora, even your own that's modded as you want, your venari will have no mods on it.