15-20 tilt and 50 rotation sounds more likely.
Yes, asymm cores do get recommended more with higher tilt. I've also been a fan of recommending large core symmetrical balls as I feel those also fit well (i.e Roto Grip TNT Infused, 900 Global Zen or Sublime)
Honestly, if all you do is open bowling, I'd look for something in the mid to upper-mid categories. Find something you like the look of and is a price you're willing to pay. The few I mentioned above are stronger than a HyRoad, but there's a lot of options that would be stronger than that