Well for the soup, check out the Defiant, should be able to round one up fairly cheap online and its great for heavier volumes.

Also, as for a pearl, look at Storm's Lucid. It's a great ball, I have drilled several for different styles of bowlers and they all loved it.

And just for future reference, it would be very helpful if you could post some general info on your game! And it would help in narrowing down what balls might or might not be a good match for you.

Great, as for the dry any Roto/Storm arsenal that doesn't have a Wrecker in it is a dis-service!! I think you could fit it under your Hy Road with the proper layout.

Also could look at the Lights Out under your Hy Road as well...

I would go with this:

Heavy: Defiant or Sync for your solid,  Lucid or Critical Theory (if you can find one) as the pearl.  Any 2 of these will cover the upper end when you need something to work in the soup.

Medium-Medium Heavy: Defiant Soul or Marvel Pearl to go above the IQ Tour Solid.  The Soul is one hell of a ball as a hybrid and is versatile.  A lot of people like how smooth the Marvel Pearl is as well.  Then below would be the IQ Tour Solid, IQ Tour Pearl, and Hy-Road.

Medium-Light: Frantic or Wrecker.  You absolutely need one of these.  The Frantic has the same hybrid cover as the Hy-Road but uses the N.O.S. Core instead.  Great with energy retention in back and carries well.  The Wrecker is going to be a little more angular in back.  The Neutron Core is also great with energy retention and also does a great job with carry.  You won't go wrong either way as you get a lot of ball for the price. 

Then if you need a solid or pearl, the Shatter and soon to be released Rumble will fill the lower end nicely.

I honestly recommend the frantic over the wrecker. The wrecker was over and under.The frantic is my go to piece. And i have a high rev rate so the cover on the wrecker wasn't strong enough on the medium oil. On medium light it's too strong. You're going to need a smooth layout for this ball to work well for you. I wasn't terrible but if you drill it strong it has ittle versatility.

It's a medium-heavy ball.  I would slot it above the IQ balls/Hy-Road but below other balls you may add such as the Defiant Soul or Marvel Pearl.

The Frantic hasn't done me wrong.  Mine is pin up since I wanted mine to be more of a skid/snap to better match my higher ball speed/rev rate (I'm a little speed dominant).  Even with this, the motion is very consistent and it's very effective.  In your case, I like the pin down idea to keep it a bit smoother.