After 9 days of running a relay with a stable IP address (with "Stable" flag during the last 4 days) and consensus bw steadily oscillating around 20 despite the 100 Kbyte/s bandwidth measured by Tor and 200 Kbyte/s bandwidth measured on the Internet connection, I guess it is time to quit. My relay is consistently sending less than 20MB every 6 hours, which probably means that is not making a noticeable contribution to Tor network.
I have also been running another relay for the last 5 days from a friend's home - he has a static IP, a different ISP from mine and twice the bandwidth. His consensus is bw dead locked at 31 and never changes. He is getting Fast flag on and off, no Stable flag, his Atlas measured bandwidth is 150 KB/s. The traffic it relays is only slightly larger than mine, so I guess it is time to quit for this one, too.
Any other advice / ideas welcome.
Rana