Properties are amazing! Literally no advanced guide that I have made does not use it! However, they have limits. This guide will teach you how to breach the limit.
Credits of @mysz, @Blackhole927, and @ClicClac for helping discover this.
Concept/Guide
There are 3 ways to change properties. One is blocks, which doesn’t matter. One is an inventory item manager (IIMs), and the other is a counter. What happens when we connect multiple IIMs to a single property? We get pseudo-properties. If we have multiple counters, then we can get multiple properties tied to one property device by having each counter edit the same property! This is the same with IIMs! So, to get the specific pseudo-property, we edit the counter we want. To get the item properties, add an item and then subtract an item.
Counter properties are called PCPs, for pseudo-counter-properties, and item properties are called PIPs, for pseudo-item-properties. Also, PCPs should always be better that PIPs, so use your counter slots first, and then use your item slots!
You can place 512 counters down, so I recommend that you always use counters.