I'm sure the flippers work fine with your settings, and by increasing the friction you'll increase the shooting angles, and you'll be able to do more backhands. But you may also increase the ball spinn, and I don't want to go back to have a ball that spins like mad, like a soccer ball or a pool ball. Then you'll need to increase the playfield friction to stop a little the extra ball spinn, but then the ball will loose some bounce on the rubbers, and you will need to increase the elasticity, and soon you'll have changed everything. A nice set of settings is all about balance. Many authors use very high friction, and the tables play fine, because all the values are balanced. I tried to find a friction value that was balanced on all the objects, and to me it should be as low as posible, and a little higher on the rubbers, so the ball still is grabbed by the rubbers. I know the shooting angles in VPX will benefit from a little more friction, but then the rest of the objects will need to be changed too, otherwise the ball will get too much spinn.
I know my flippers are not perfect, I concentrated more in the shooting angles, and being able to do some normal tricks, like drop catches, post passes, backhands, and mostly that the shooting angles that are stable, and that they feel natural. Some tricks will be more difficult than others, and some imposible, like tap passes or tip passes, as they need some settings that will break the normal working of the flippers. You may do a tap pass by nudging
. I know that's almost imposible in real pinball, but not in VPX
Also I use higher end angles to get more predictable shots, but on some tables you'll need to lower the angles to suit the table. On some tables the flippers angles are very low so it is quite difficult to catch the ball. I have seen those low angles in PAPA videos where tables were used in competitions. But in VPX, lower end angles means poor backhands and strait up shots, and they work better with tables with a lot of targets on the sides.
The main reason I use low friction on about everything is to try to get a more natural ball flow. Still there is enough friction to see the effects on the ball, but not too much that it stops feeling like a small metal ball.