You could get a power adjuster from Magnum Air Power (MAP)
https://onlinestore.magnumairpower.com/products/rifle-adjuster Yes, it’ll cost a bit more than just a spring but it will allow you to adjust power levels as you want. Turn it in for more power back it out for less. If you have a chrony you can map out how much power and number of shots you get with number of turns on the power adjuster. It’ll also allows you to remove and swap springs without having to disassemble your gun. Makes it easier to experiment with different springs to see what works best for you.
But truthfully I’d save the money on mods for the 2260 and just leave as is and enjoy it for what it is and look at a PCP rifle that can more easily and readily deliver the power you want. There’s just more potential with HPA than with CO2. I’d suggest looking at the PCPs that have adjustable power via an adjustable transfer port. This way you can turn the power up or down as you desire. You might consider something like the JTS Aracuda or the Kral Puncher rifles or the Benjamin Craftsman series in the entry level. A $50 hand pump can get you started in PCP.
Either way it’s all about having fun and enjoying what you do with what you got, so which ever way you go, good luck.