My personal opinion is that you can get away with a simple 3 ball sequence and a plastic ball on almost anything but the extremes. Your ability to play different zones, change hand position, and modify surface will determine how wide “the extremes†are for you.
By a simple 3 balls sequence, I mean:
Ball 1: Fresh shot - very smooth and controlled ball with surface
Ball 2: transition begins to occur, and you’re moving left but no longer carrying with ball 1 - Ball with a little less surface that rolls heavy in the midlane but still pops
Ball 3: lanes transition to the point of getting walled up - Ball with even less surface, easier length, and more pop (aka, the house shot look)
The good news is that you’ve already got that sequence pretty well covered - start with your Trick, transition to the No Rules Pearl, and then ball down to the Hyroad when they get walled up. Building a sequence, IMO, gives me total confidence in making adjustments - the adjustments become consistent pattern to pattern unless the pattern plays to an extreme that forces you outside of your sequence and into the rest of your arsenal.
SO to answer your question - your gaps are simply filling in those pieces outside of your sequence. If your speed dominant, add an Idol to give you an option if the pattern is longer or very heavy. If you’re rev dominant, add a Hustle Ink to give you an option if the pattern is shorter. If you cannot play up the boards to start, you’ll end up very deep by the end and need a true skid snap ball at the bottom. Etc.