amanda compression problem

[mahadzar81]

Hi there,
i'm using Amanda version 2.5.2p1 running on Linux Suse Enterprise Edition 11. Based on my amanda report, it shown as statistic as below

STATISTICS:
Total Full Incr.
-------- -------- --------
Estimate Time (hrs:min) 0:01
Run Time (hrs:min) 5:11
Dump Time (hrs:min) 5:09 5:09 0:00
Output Size (meg) 74369.9 74361.3 8.6
Original Size (meg) 104036.0 104008.7 27.3
Avg Compressed Size (%) 71.5 71.5 31.5 (level:#disks ...)
Filesystems Dumped 5 4 1 (1:1)
Avg Dump Rate (k/s) 4102.9 4104.5 950.4

Tape Time (hrs:min) 4:31 4:31 0:00
Tape Size (meg) 74370.0 74361.3 8.6
Tape Used (%) 73.4 73.4 0.0 (level:#disks ...)
Filesystems Taped 5 4 1 (1:1)

Chunks Taped 0 0 0
Avg Tp Write Rate (k/s) 4680.7 4681.3 2229.7

USAGE BY TAPE:
Label Time Size % Nb Nc
Wednesday 4:31 76154848k 73.4 5 0

It looked significantly different when i used amanda version 2.4.4p3 befoere this as below

USAGE BY TAPE:
Label Time Size % Nb
Saturday 1:25 75295.3 74.3 6


Is there any ways to compress the dump file into smaller size? i have set setting in amanda.conf for compression setting.

define dumptype gnutar {
program "GNUTAR"
comment "dumped with tar"
compress server best
index
priority medium
}

i have set dumcycle as 0 since i want to have full backup on every night. Can anyone help me on this problem?