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You should be able to get depressurised baskets for your machine and do some simple upgrades, this article helped me do some mods, admittedly I have this very machine but there won't be anything stopping you doing similar things to your machine.
https://medium.com/@danielabdilla/mastering-coffee-from-your-kitchen-top-45276afaea00
Are you using the pressurised basket? If you grind too fine and/or tamp too hard they clog up, they're designed to give a consistent shot with minimal effort. If you want any control you'll have to swap it for an unpressurised basket.