I have a 1x7 speed city bike hybrid.. it's great except when i try to hob a curb or hit a big pothole, the chain will get thrown of the chain ring

it seems the main problem is that there isn't enough tension in the derailleur, so on a bump it gets thrown around a lot. I have a cheapo Shimano Altus rear derailleur on the back. do you think if i got a higher quality derailleur it would be stiffer?

the other options are to use a front derailleur as a chain guide, or a bashgard and one of those mtb chain guide things, but i really really don't want to do that if i can avoid it

another option would be to Single Speed it, though i like having gears. but i'm getting tired of having to put the chain back on.. even train tracks can mess it up :\