I'll assume you are just keeping your Ride and Hyroad. If you have a 5 ball limit, are you carrying a plastic ball? Spares are the most important thing at Junior Gold, and no matter how good you are, you will shoot a lot of them. I remember my first Jr. Gold back in Lakeland in 2002 or 2003, I had a Predator, Erase-It, and Track Magic (polished), and spare ball. I almost made the cut without knowing anything about patterns and just making spares. If you can kill your Ride as a spare ball, then more power to you (and you don't have to waste a ball on plastic).
As I recall, you bowl on a long, medium, and short pattern. Part of "creating" your arsenal is learning how to play the patterns and thinking about what pieces could be useful on each. Therefore, I will break it down by pattern:
Short: At least when I bowled, the short pattern was not "throw it to the gutter and watch it hook back", it forced you to be exact with your angles through the front part of the lane. The Ride may come in handy here if the gutter (1-2-3 board) is being touchy. Don't try and force the gutter shot if it's not there or if you see hang on the gutter, because you are asking for trouble if you do. If the 1-2-3 boards are hooking back, by all means play it. I would put some surface on either your Hyroad or Ride for the short pattern to even out the motion down lane, then polish them back up (or 4000 grit) for the medium and long patterns. If the gutter is not in play, use a weak piece (Ride/Hyroad), take hand out of it, and play between 5-10 until something develops. I guarantee if the gutter isn't hooking scores will plummet and an even block will be near the top.
Medium: Often this will play very flat and similar to the old US Open pattern. I would say start somewhere around the track with a stable symmetrical piece (IQ Tour, Hyroad Nano, Edge, Magnitude 035). Keep the ball "in-play", meaning don't create big angles through the front of the lane and keep your angles in front of you. Eventually, after about game 2 or 3, you will be able to move left and some area may develop (you may have hold or a hook spot, depending how the pattern breaks down). You may be able to switch to your Hyroad here, then eventually to your Ride if it gets dry enough.
Long: Again, keep your angles direct on the fresh, this is most important on the long pattern since you won't have much free hook to the right. Take your ball speed down. I, like you, didn't have a really high rev rate in my younger years and started bowling better on long patterns when I simply took my ball speed down to help the ball read the lane better. You will most likely start targeting between 12-15 board, then just parallel moving left throughout the block. You should start with a strong cover/core combination (Phaze II, Sure Lock, Kingpin), then transition left keeping your angles tight with less surface to create more hold and angle down lane (Marvel Pearl, SoniQ). In my experience, on longer patterns I tend to look for hold area, where the ball is basically fading back to the pocket (going left to right) until about 15 feet in front of the pins where it picks up just enough to carry effectively. It's often mistaken that you need a lot of revs to bowl well on long patterns, I often think tweeners like yourself may have an advantage over power players because you don't have to worry about your ball reacting violently down lane. You don't have to cover as much of the lane and therefore don't open yourself up to unexpected ball reaction.
So, to summarize ball choices, I would go with the following:
Ride (adjust surface for short pattern, to maybe 4000)
Hyroad (adjust surface for short pattern, to maybe 2000)
Benchmark sym/solid (IQ Tour, Hyroad Nano, Edge, Magnitude 035)
Strong Cover/Core Solid (Phaze II, Sure Lock, No Rules Exist)
Stronger core/Pearl cover (Intense, Marvel Pearl, SoniQ, Edge Pearl?)
Buddies Pro Shop has Edges on sale for $69.99 right now, so that might be a deal to look into. You may even be able to fit an Edge Pearl into the last spot (Stronger core/Pearl cover) depending if you can get it to be stronger than your Hyroad. You need a ball for that first breakdown that the Hyroad may not be strong enough for.
