Wow- a goldmine of replies, thank you all. Rhodium, thanks for correcting my misbelief re: eugenol. For anyone interested, I have followed this up and the requirement of distilled seed crystals is unnecessary. It seems I had an extremely poor starting oil, which, when replaced with a nice high grade from the far east solved the problem.
At 0-10 C, 500 mls in a 1 Litre flask yeiled perfect crystals overnight with no seeding. These were extremely large, ideally shaped, and perfectly clear. Decanting once, partially thawing , and refreezing gave excellent purity.
It seems, after 3 different oil sources ( I didnt mention the first), that oil quality is a major factor. The brazillian version and most particulaly the North American version (of course these are sources swim used and there may be others, but it should be noted that they were carefully researched from numerous suppliers) were very impure and very difficult to freeze without seed crystals (the NA version would not freeze at all w/o seeds). The latest source responded as noted and had a very high yield (95% +).
There has been no problem with odors, any spillage is easily and quickly cleaned with windex (the ammonia works wonders) to eliminate all traces. A simple celophane wrap over the lasks works perfectly in the fridge. Chose to obtain a small second fridge for this purpose now, because the technique is so very effective, though there was never any odor (or other) contamination in the main fridge.
The idea of preboiling to remove more volatile aromatics is appealing and will be tried.
Thanks again to all.