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But it seems the subscribers callbacks don't work.

The callbacks are probably fine, and this is not a ROS problem (so there's nothing wrong with the publishers, subscribers or dyn re_cfg here), but most likely a Python scoping problem: you're trying to use variables (in1, in2, gain1 and gain2) in the body of your while-loop that are out of scope at that point (ie: they do not 'exist' there). See random tutorial about Python variable scopes for some explanation.

A quick work-around could be to put in1, in2, gain1 and gain2 in the global scope. Using a class and making those variables members would probably be nicer.

Edit: note that besides the scoping issue your current implementation also has some other issues:

1. no rate limiting of your main while-loop (see wiki/rospy/Overview/Time - Sleeping and Rates)
2. mixing an event system with a periodic, synchronous sampling one (and assuming that the event callbacks will be serviced at suitable intervals so the pub1 and pub2 publishers don't republish old data)

The first can lead to starvation of other tasks/nodes, while the second can lead to missed updates and publishing stale data (among other things).