If you are at the Ridge, then indeed heavenly is the easiest. Any other resort is 1hour away.
As far as the drive, we are in spring conditions so everything is somewhat on an accelerated time schedule, and each run may turn from Icy, to hero for 1 hour, to slop and you need to move to the next area. You will need to set your expectations that it may start to get slushy, chopped up or sticky by 2 or 3pm and time to head to the lodge or bar to enjoy apres ski in the warm sun. So perhaps you'll want to drive anyway to check something else out.
If you go with heavenly, then with the vail resorts multiday pass you get kirkwood and northstar.
Kirkwood is more for unmanicured terrain, with slow lifts so it is not for what you stated you like to do. If you do want the "interesting" terrain though kirkwood is a special place.
Northstar has steeper groomers but is at lower elevation so may start melting near the bottom. However, the runs at northstar tend to be completely straight versus at least at heavenly there are a few curves and cambers so are a bit more lackluster.
So of the 3 vail resortsheavenly is your best bet to rack up groomer vert.
The best groomers you should do are:
NV side: Olympic through Stagecoach run (esp in the morning)
NV upper mtn: comet run.
CA side: Ellies run (if recently groomed), otherwise High five.
Northstar: lots of groomers here, just check for grooming report of the day.
drifter castle peak
If you're skiing 4 days,1 day heav. 1 day squaw.
If you're at the ridge, you might as well do 2days at heavenly just for the convenience. Which leaves you just 1 day left.
I'd say your best bet for the floater day might be Northstar-3days of vail resorts, or perhaps Mt Rose. The only other "close" resort is Sierra At tahoe, and I haven't skied there for 3years.
Unfortunately the VR tickets don't have discounts. If that is playing a role, hopefully you can hook up with someone to go to the window with you for buddy tickets; or the 3day multiday pass, but def keep the expectation in mind the window price is "not worth it" and is kept
artificially high to lockdown the epicppass sales. If you're getting free tickets somehow, that definitely should factor into your equation.