Is there anything you don't like about the viper vx gear? If not then why not get a new set?
My recommendation for chest rigs is always the SADF M83 chest rig. I'm no way a big guy and mine fits my skinny body with more room for adjustment.
Lastly and mostly only because nobody else has posted it, there's always this😁
https://www.evike.com/products/31263/