If you are getting washed out colors now, you'd probably be getting them with Portra 160VC too using the same processing and printing you use now.
160VC isn't really any more saturated than Gold 100 IMO.
Though some might have different observations, yes overexposing negative film by say half a stop does tend to saturated colors a bit, because underexposed film tends to be washed out, and by overexposing a bit, you are moving your shadows and low midtones away from that underexposed part of the sensitivity range. But it's barely visible.
Though too much overexposure has the reverse effect, it can further desaturate colors.
If you are enlarging yourself, try using a different paper (what paper are you using)
But if you want a saturated negative film, try Kodak 100UC instead. 160VC has moderate saturation IMO, and a moderate to high contrast (which also makes it a bit punchier).
Also, keep in mind that Portra 160VC is a very unique film, and sometimes you can recognise it just by seeing a picture. It has these signiture brownish shadows and punchy contrast and an unique look to the colors.
Finding a saturated film is easy.
Kodak E100VS (similar also to Elite chrome extra color) isa very saturated film, and then there's Velvia