AVCHD to Mpeg2-dvd = bad shimmering footage

[Kentho]

Nightmare trying to export avchd footage (shot with panasonic sd90) from adobe cs5.5 to Mpeg2-dvd format. The result on dvd is not good, a lot of shimmering lines and artifacts. When I use HD-writer AE 3 to export the m2ts-files to dvd, the result is exellent. I don't know what HD-writer does, but I can't get the same quality in adobe premiere export, and I have tried a lot of settings.

Here's the original videofile data (m2ts-file):
Format : BDAV
Format/Info : Blu-ray Video
File size : 97.8 MiB
Duration : 32s 908ms
Overall bit rate mode : Variable
Overall bit rate : 24.9 Mbps
Maximum Overall bit rate : 28.0 Mbps

Video
ID : 4113 (0x1011)
Menu ID : 1 (0x1)
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.2
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Format settings, GOP : M=3, N=24
Codec ID : 27
Duration : 32s 600ms
Bit rate mode : Variable
Bit rate : 23.7 Mbps
Maximum bit rate : 26.0 Mbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate : 50.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.228
Stream size : 92.0 MiB (94%)

And here's the Mpeg2-dvd export from premiere (cut/part of the original footage):
Format : MPEG-PS
File size : 11.3 MiB
Duration : 10s 259ms
Overall bit rate mode : Variable
Overall bit rate : 9 272 Kbps

Video
ID : 224 (0xE0)
Format : MPEG Video
Format version : Version 2
Format profile : Main@Main
Format settings, BVOP : Yes
Format settings, Matrix : Default
Format settings, GOP : M=3, N=15
Duration : 10s 240ms
Bit rate mode : Variable
Bit rate : 7 552 Kbps
Maximum bit rate : 8 000 Kbps
Width : 720 pixels
Height : 576 pixels
Display aspect ratio : 16:9
Frame rate : 25.000 fps
Standard : PAL
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Interlaced
Scan order : Top Field First
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.728
Stream size : 9.22 MiB (81%)

You can view the videoresult here:
http://www.youtube.com/watch?v=VrtksUzzGLo&feature=youtu.be

I know it's progressive footage I've converted to interlaced, because I want the motion to be smooth. But I have also tried original interlaced footage with the same result. And I tried progressive footage and exported it progressive, and even if the result was slighly better, it's far from good, like the impressive export from HD-writer. I observed that HD-writer had coverted the progressive footage to interlaced, upper field with great sucess.

I can't stop thinking that it must be possible to achieve the same result with adobe export as with the HD-writer software. I would use hd-writer, but it's very limited on the editing side, and it will only accept the native camera file-format to export to dvd. I want to edit in premiere, and get a good quality export without the shimmering lines. I have checked the maximum rendering quality, and maximum bit depth without any luck.
Anyone have an idea what to do? I'm really stuck.