Welcome and nice to hear the upgrade :)
how many clicks are there between "too fine" and "too coarse"? The "sweet spot" is a on a kife edge, and small changes either side will produce (as youve found) gushers or blockers ;D
Unfortunately some grinders make the steps too large so you cant get right on top of that sweet spot.
If this is the case, and theres only one click between gushing or blocked, stick to the blocked setting but tamp lighter and dose less.
Also, what beans and when were they roasted? If theyre older than 2/3 weeks from the roast date, youll have to grind finer, potentially pushing you over the limit.
Hope that helps :)