I have been just getting high pr manual blog comments, small profile links with sick submitter, article submits. It has all been steady and no mass blasting at all.
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thats some drop that is.
as you say, youve been keeping the backlinking white hat, so a few questions for you:
1. how many backlinks in total
2. over what perioid of time did you acquire them
3. what percentage of your links come from article directories
4. how many core articles were there before spinning
5. how many separate directories have you put spun articles on
reason for asking is that some I.M.'ers have seen (some) of their sites take big hits recently if there was a disproportionate reliance on article directory links...