Don't give up on the Aguila ammunition until you try it. I have shot a lot of Aguila Super Extra high velocity 40 grain round nose and had very good results with it in three different 10/22s with 18.5" taper barrels. I have had no reliability issues. Accuracy is very nearly as good as with CCI Standard Velocity. I know of others who have had good results with Aguila Super Extra standard velocity 40 grain and with Aquila 40 grain Pistol Match.
Did you send that trigger group back to Brimstone? I have heard that their customer support is excellent. I know others who had trouble with their Brimstone modified trigger assemblies, sent them back, and never had any more trouble.
You’ve got to try a particular load in YOUR rifle to know if it is any good. That said, some ammo typically works better than others and you can use that as a guide to selecting loads to test.