Yes, makes sense, just had been used to using the interpetation as per Shrink. There when a target size of 4360 was entered the project size would show up as 4360 MB on the Roxio EZ 6 burn program (with about 120 MB spare). It is just a matter of adjusting to the interpetation of size for CloneDVD versus Shrink, which I had been using for a while. Setting custom to 4600 MB for CloneDVD gives me the result I was looking to get.
I have purchased AnyDVD and CloneDVD (along with CloneCD) after trying them out for a while. I have been using DVD Decrypter and DVD Shrink for quite a while and supported their authors. They both were and IMHO still are good programs and in conjunction with AnyDVD will probably remain quite usefull for a long time. So far the big advantage I see with CloneDVD is ease of use and speed. The DVDD/Shrink combo is slower but seems to give better results (with deep analysis) for movies that require high compression.