Planetaries for inline jung pump connection

[tracksntreadslou]

I have been looking for a decent quiet planetary for running a Jung pump ..Has anyone else found anything that is suitable for this application ..I ended up making my own and hope it will hold up ..parts from a cordless screwdriver with approximately 8 to 1 ratio ..My motor is 1600 kv running 12 volt
12 x 1600 = 19200 / 8 = 2400 rpm max ..Suitable for the jung
Would it be better run say a 700 - 1000 kv motor with a 4 or 5 to 1 ratio and have a less likey to fail gearbox thoughts ? .. My Motor is running at about 150 degrees ..does this seem about right
what temps are you guys getting with you brushless systems ..they say not to run them over 175 degrees ..thoughts?