Ditch the pressurised basket pronto - youll never look back.
You should be able to go finer on the grinds and the seal shouldnt be an issue on a new machine. My only suggestion is make sure youre not overpacking the basket (ie too high/too full).
Fill with loose grinds to the top, scrape level with a knife and tamp while to tryingto leave about 5mm from top edge. Give the tamp a twist to polish/smooth the top surface.