i convert my dvds to divx for some time now using gknot+divx5.0.2pro with the help of the doom9.org's guides
but i have some questiong i would like to ask

1.what r the best settings when converting anime dvds to divx?i have heard that cartoons generally have large contrast which cause problems during the conversion-i converted akira dvd to 1cd divx and i must say that the quality was dissapointing any suggestions here?
2.some divx movies i have made although they have good quality in the background,there r some strange artifacts around the people when they move-its like the effect when in front of a person there is warm air-what causes this and how can i fix it?

3.i have this bizzare problem with some dvd movies-the final divx size is below the desired 700mb usually about 300-600mb-this happens only with movies which r interlaced and ofcourse i have to use the field deintrelace filter in gknot-why there is such difference in the final file size and how can i get the correct file size so i can have better quality?

any help is welcomed
thanx in advance