One suggestion is to be VERY conscious of how you're handling the machine. Best approach seems to be having a VERY light touch on the lockdown bar, and using index or middle finger to tap the flipper buttons. Most world-class players I watch have this "light touch" when they play. Keep your feet in a solid stance so that you have a base for nudging the game with one or both hands as needed. If you're leaning on your hands or wrists, you are losing a lot of quick/accurate control (of buttons and nudging), as well as creating stress in your arms.

Another tip if you'll be playing long sessions is to wear a pair of weightlifting gloves. These fingerless gloves will soften impacts on the palms of your hands when nudging. I tried a pair with a gel palm and they were too padded--I prefer the feel of just a leather palm.Mesh backing helps keep the hands cool and comfortable too....

Yup, this is a good suggestion! It also brings your vision line closer to the pf, which can help line up shots. Top players tend to do this. I've been trying this myself (changing to a lower position for better view of the pf, less of an 'overhead' view) but it's hard to get used to!