I am also building an arsenal, I currently have a Hyper Cell drilled 4x4x2 for heavy oil, I have a Optimus as a benchmark ball that I have not drilled yet, I have a Motiv Ascent Apex for dryer conditions, also not yet drilled, and a White Dot for spares..My question is, how should I drill the Optimus and the Ascent? The Hyper Cell works great on fresh with 4x4x2, do I do the same pattern hoping I have a decent choice of balls and I wouldn't have any overlap with the same drill pattern, or maybe something different? I mainly bowl on 42' house patterns. Is my ball selection ok, too?
Based on the core numbers and the surface materials, I think that you will find the the Hyper Cell will actually be your middle (benchmark) ball, with the Optimus being more for heavier conditions and the Ascent Apex for drier conditions. Your 4X4X2 drilling is pretty strong, and is a good layout for most medium rev/medium speed bowlers. I would recommend sticking with the same layout for all of the balls so that you can see the actual differences between them which makes on-the-fly ball change adjustments much easier. You can also adjust the surfaces to move them further apart or closer together.
Your ball selection is OK, however at some point you might want to add something between the two more aggressive balls and the less aggressive ball. Something like a Storm Sky Rocket would fit nicely, I think.