If I understand your application, of course you do NOT need to go to the trouble of cell compression. You describe keeping those cells normally charged at 95% capacity, with them discharge cycling only a couple of times a year. I recall that Lishen, for one, claims 3000 charge/discharge cycles WITHOUT cell compression (and then still retaining 80% of original capacity at 3000:cycles). It sure sounds like you wouldn‘t get much benefit from cell compression.
If I were you, I would still clamp them lightly with rigid tie rods, or something simple like Kapton tape, but not fuss with springs. The cost of some simple rigid constraint is slight.
But I would be more comfortable with your plan if your power supply had SOME reserve capacity above your normal 15-25 amp load. I would want a 30-amp power supply. Why call upon the batteries for any more than momentary starting surge if that is avoidable at nominal cost? Of course, this depends on how much of the time the system is calling for the upper limits of that 15 to 25 amp load, which I can't tell.
Most of us here think in terms of applications that are much different than yours.
I think I'm going to put a sheet of some sort of thin closed cell foam between the cells and strap them together.
I did manage to find an AIMS charger which Will has featured on his YouTube channel, it's rated at 37.5 amps and has a Lifepo4 setting. They are on backorder everywhere, Amazon had one that had been returned at a great price.
I understand my application is much different than most here and in reality, AGM batteries are probably better suited to my needs. (at least simpler) The only problem with them is from my experience in the telecommunications field, even with the most fastidious care, they begin deteriorating as soon as they are placed in service and will be scrap in 5 - 10 years. The added bonus to the Lifepo4 battery is this gives me the option to repurpose some of the solar panels on my roof in a SHTF scenario with much more usable capacity. I already have a 40 amp MPPT charge controller and wiring harness made with MC4 connectors so that I can quickly unplug the SolarEdge optimizers and connect to a few of the easy to reach panels. It will be an ugly toss the wires over the side of the roof and bring them in through a garage window sort of thing, but I'll have some level of off grid power when the zombie apocalypse happens.