Hi 👋 Your journey is similar to my own in that i rekindled my teenage and early twenties love of astronomy. I also bought a 127 Maksutov Go to ,and a 8” Dobsonian. With regards to the accuracy of your go to mount, I generally manage to get my targets in the FOV. I started with a 32mm EP to increase my chances, but once I was accustomed to the nuances I swapped to a 25mm 60 deg. When you are centering the stars finish with the up/right keys. I now use a 12.5mm reticle EP for accuracy. If you don’t have one then I found that centering the star as best as possible with a short focal length EP, then defocus the star to a disc as this enables you to judge the centering better Hope this rambling helps