I'm not sure if this idea would have any advantage over what it appears Adam is currently doing, but… Could Adam just stabilize a large number of the smallest space bubbles he can find, then push them together so they're touching, reinforce their outer shared walls, and then pop their inner shared walls to merge them all together into a single dimensional bubble of the size he desires?
Actually… For all I know, that's what he's actually going to end up doing once he acquires a usable perspective to measure the size of a dimensional bubble against. Although, I'm not sure there would even be a point to merging numerous smaller bubbles, if bubbles of such a great variety of sizes are already available in seemingly endless quantity, and if the process of safely merging bubbles ends up somehow costing more energy than stabilizing a preexisting bubble of the desired size would take.
Come to think of it, it might end up being a more efficient use of energy and time to pursue a method to create storage rings with a purposefully selected collection of dimensional storage bubbles in the right sizes, with a sophisticated master control formation. Like: if you wanted a ring that could store a very large amount of a liquid, or of some kind of particulate matter like sand/gravel/seeds, you'd want a ring with an enormous number of very small bubbles that could split the deposit of matter between many bubbles. You'd also want your master control formation to keep track of the which bubbles were used for what deposit of material, and ideally, also keep track of the relative position of the contents of each bubble compared to the position of the contents of the other bubbles used for the same deposit, at the time that it was first stored. This should theoretically allow the ring to retrieve the entire deposit in more or less the same shape and distribution of pieces that it had when it was deposited. No guarantees though, if someone decides to only retrieve a fraction of a deposit; although there might be a "software" setting to only allow certain deposits of material to be retrieved all at once or not at all, without disabling a safety toggle. But that's mostly just for a ring that specializes in storing a reasonably uniform substance or substances cheaply… If you were to use statistical analysis on the size of the types of things that need to be stored for a specific purpose, like blacksmithing on the go, for example, you could build-in a certain safety margin in the size of the available storage bubbles bubbles, along with the number of bubbles of a given size. This would ideally result in a ring that is rated to hold a certain number of anvils, forges, ingots, tools, protective equipment (leather aprons/gloves and such), and combined volume of liquid for quenching and/or cleaning and/or etching, etc. All for a significantly lower cost to produce in terms of energy, and a resulting reduced price of purchase for those seeking to buy a ring with a given purpose in mind, as compared to a storage ring that has a high enough safety margin built into the size of its storage bubbles to be sold as a general purpose storage ring. On the subject of a "general purpose storage ring", I can see two different approaches to deciding the sizes of the storage bubbles. One: The brute-force method that wastes a ton of energy to create a modest number of relatively large storage bubbles that are guaranteed to fit a small number of items under a certain size. Two: The averaging method, which uses a series of storage bubbles that decend from a maximum sized bubble to minimum sized bubble, with the intermediate steps between decreasing linearly, and the number of step between choosen to equal the energy cost of creating general purpose storage ring of method number one. This second method would allow you to create a ring with a much greater total volume of storage for the same energy cost of the first method, while sacrificing some flexibility in what you can store in it, but in such a manner that is predicable, and based on the assumption that everything that you might want to store in a "general purpose" storage ring in not likely to all be of a size requiring the maximum-sized storage bubble.
.
