a couple of things in your configuration need to be changed. I have made some additions to your current config, one of them being the use of the physical BRI interface instead of the dialer. Also, the watched route needs to be referenced in a dialer map as well. And last but not least, deny EIGRP traffic to bring up the ISDN line.
Can you try this and see if it works better ?
isdn switch-type basic-net3
ip address 184.108.40.206 255.255.0.0
ip route-cache flow
ip address 192.168.13.38 255.255.255.252
description Back ISDN, Nr. 4697732
ip address 220.127.116.11 255.255.255.0
no ip route-cache
no ip mroute-cache
dialer map ip 18.104.22.168 name backupmain broadcast 4389000
dialer map ip 172.20.0.0 name backupmain broadcast 438900
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