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I was always under the impression that it was better to have more weight closer to the turning axis, having a longer counterweight bar will introduce more flexure and a greater swing radius.
As far as weight on the bearings, it should not have any effect, no matter what you are doing you are still balancing the OTA so the weights should not be an issue.
I prefer the weight in close to the head, to me you have much better control of how it is distributed ie: I place a slight presure on my RA worm to maintain a slight imbalance, when I swing through the Meridian to the other side, that weight has to be moved to maintain that slight imbalance, a lot easier to do than mucking around at the end of a long shaft.
There is a method of calculating weight on the Robin Casady site.
Cheers
JohnG
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