compression level problem with dvdshrink

[musicthebee]

I have DVD9 with around 4:30 hours video on it. I have ripped it with dvddecrypter. When I try to shrink it with dvdsrink gives the highest compression level @52% and the size is coming out to be 5.4 Gb(Min Size). Is there any way I can force dvdshrink to get higher compression levels?

Thanks

[setarip]

Use DVD Shrink in a second pass on the 5.4Gb results from the first pass...