SETI@home workunits arriving sporadically in large quantities

I have CPDN and S@H running in a stipulated 1:2 ratio across 2 processors, and have preferences set at "keep 7 days workload", because there are times when I'm away from a net connection with my laptop for a few days at a time. What I find is that the ration of average work done ranges from about 1:5 to about 1:1. typically the S@H workunits all get executed, such that the avg work done is about 1:5, and when BOINC runs out of S@H workunits, it determines that it needs to give CPDN a go for a while and does not acquire any more S@H work. The ratio of avg work done gradually rises to about 1:1.5 or sometimes nearly to 1:1, then BOINC realises it needs a bunch of S@H and so acquires a week's worth, all with deadlines of a week or so away. It then decides that it is going to have trouble doing them all in a week and starts running them all with priority which means that for the next week S@H runs almost exclusively and CPDN gets almost nothing. So at the end of the week, there is no S@H work left and the ratio is back to about 1:5, so BOINC runs CPDN and doesn't ask for any more S@H, and so we go again.

This boom and bust cycle plays out endlessly. How do I get BOINC to keep a week's worth of S@H but still get work done progressively?
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I see the issue with the 7 day connect interval, and have changed it to 3 + 4. But I don't think that's the main problem. The last batch of workunits I got was about a week ago, and they all came with a deadline of 23 or 24 Nov, and 45 hours of computing required, which given the number of WUs amounted to about as many hours as there were between arrival and deadlines. It's as though it obtained 21 days of computing when I asked to always have 7 available. BOINC's enthusiasm is a little excessive. My usage patterns are fairly consistent, so BOINC can't use the excuse that it thought it could get through them all. As soon as they arrived (like, instantly) S@H went into high priority mode. Which is a paradox.
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