Regarding mantis ramps.
I don't want to bash any products but I have to give my experience. I bought a shadow for second time and a couple ramps had broken welds. The game came with new mantis ramps. I installed. I thought they played horrible. I had an ungodly amount of wire form jumps diverting right or slams into the ring bracket diverting left on the left ramp. I would even get wire form jumps on left divert of right ramp. I played like this for a while and tried every remedy. It was killing the game play bc ball would jump extended modified switch I have rigged up that is impossible not to register. See pic. I decided to weld up the old ramps myself. I replaced them and game plays flawlessly. Not one wire form jump. Switch registers everytime.
The mantis ramps have a very slight increase in pitch. The diverter has a gap between the ramp that the ball rolls in keeping it from riding up an launching over wire form. That gap is minimized with the greater pitch allowing the ball to travel up and launch.
The mantis ramps aren't cheap. A welder would weld yours for weed money. Either that or spend money on a harbor freight welder and do it yourself. I don't know shit about welding and I did it fine. Any birdshit will be on the bottom and not visible. Just wire wheel or grind the welds to clean them up a bit if worried about something you won't see. Weld from the bottom. Welds will be under.
See pics. One brown mark I didn't bother cleaning.