New machine, new grinder, new baskets. You have introduced a heap of new variables to your routine, and have to undergo the wonderful and challenging experience of learning how to bring out the best from your equipment. Your grinder is certainly capable, it is your technique that requires attention. Experiment with different doses and grind setting settings, scales will help you get consistent. Try and stick to one type of coffee, this helps to eliminate another variable. I found with my "triple" basket, (not a VST) that you can vary the dose immensely, and still get great pours. Ensure you distribute the grinds evenly with a skewer. (the "sewer" you mention is no doubt a typo, but still very funny).
Have a read of this article:
Espresso 101: How to Adjust Dose and Grind Setting by Taste - Tips and Techniques • Home-Barista.com
Develop some patience (I know it will be frustrating), and enjoy the journey.
The triple basket allows you to pack a lot of coffee into it. If the puck is not properly compacted the water will look for the path of least resistance. A simple technique is to distribute the grinds in the basket, and gently tap the group handle a number of times to assist the grinds to settle evenly, then tamp. Ten gentle taps to settle the coffee is a method described by Orphan Espresso, however, I cannot remember the link to it.
Hope this helps.