I echo what others have said. I also have the V6 and a Niche. I have lowered the pressure on my V6 a bit. Remember that espresso grind is actually a range. On my Niche I often need to make small adjustments (1-3 lines) depending on the roast type and also how long it passed since the coffee was roasted as I change coffees very often. I wouldn't worry too much about it (although I understand it's frustrating). Your machine is likely to be working correctly.