I have several C-track Märklin 24624 switches (double slip), and I've noticed that the motors frequently struggle to fully switch them to the end position, resulting in the tongues not being securely fixed in place. As a consequence, the tongues can slide out from the rail, leading to derailments.

Do you have any suggestions for alternative motors or drives to address this issue?

Additionally, the rods responsible for controlling and moving the tongues beneath the track bed are not rigid enough. The entire mechanism seems overly delicate and lacks room for error.

I wouldnt use any greasy/liquid lubricant on points!

I use graphite. You can scrape it off a pencil, if you dont have anything else.

Graphite, a great lubricant, is electrically conductive so I would not use it anyplace that might carry current. I use it only in places where dust and dirt could accumulate on any parts - cylinder locks as an example. Silicone lubricant should dry up pretty quickly. I use it where plastic rubs against plastic above the track like in bogies or couplers. Teflon lubricant is really good but usually only available in spray so can not be controlled easily. You can spray it on something like a sheet of paper and then use a brush to apply it to small areas. The silicone avoids that need.