tuning dumpcycle, runspercycle, and tapecycle

[David Newman]

Greetings. For backups to a server with one DLT-IV drive, I would like to 
change the tape once per week. During the week, I would like to do one 
full backup on day 1, and incremental backups on days 2-5.

To do this, I set "dumpcycle 1 week" and "runspercycle 5" and "tapecycle 1 
tapes". However, in the dump reports, I get this message every dump, even 
on the incremental days:

planner: tapecycle (1) <= runspercycle (5)
  planner: Full dump of hostname.networktest.com:/ promoted from 6 days
ahead.
This sounds like amanda does a full dump each time. True?
If so, what is the correct config for one full dump plus four incremental 
dumps?

This is for 2.4.4p4_2 on FreeBSD 4.10.
Thanks!
dn