A way to think about this is that you recharge VP at 20% per day. It takes 5 days to recharge 100% VP. But, when you undelegate SP, it takes 7 days to become available again. This is desirable behaviour otherwise we can make an upvote circle as you described.
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Thank you! That makes a lot of sense -- delegate/undelegate takes longer to "recharge" than voting down to 0% would. Glad that potential loophole was plugged!