Yup, Viento to HR is tricky as you mention, there’s barely five good miles out of the eight. Unless you’re into a pump fest, best to do as the others mentioned in the West. Crowding though is unlikely to ever be an issue (except through the Swell/hatch area). The first 3.5 miles can be excellent along the Oregon side and you’re unlikely to see another soul.
The Silos at Biggs is still a launch last I saw (which was late Sept). If it’s not just launch from Maryhill, you don’t lose much and the waves are great all the way. It’s only a 20 minute run unfortunately.
Blalock to Arlington is big and consistent for about eight miles (crap launch though). Push it all the way out to Three mile for 22 miles of fun (good luck with that 
).