Not only normal, but typical. And, not necessarily a problem (see http://poolsolutions.com/gd/hiphpool.html)
Actually when you're cleaning gook, it's often better to be at a high pH, since the intermediate products that form at a higher pH, as the chlorine 'burns up' the gook tend to be less noxious than the ones that form a lower pH levels.
Anyhow, 10 gallons of 6% bleach on a 30K pool is about 20 ppm of chlorine. At levels above 5 ppm chlorine, most pH tests are invalid. (Taylor's are probably OK to 15 ppm). So your pH isn't necessarily what you think.
Repost with post chlorine test results.
Also, don't panic if you keep having to add chlorine: it's not unusual for cleanup to consume 100+ ppm of chlorine! If at all possible, filter and vacuum, too. If you REALLY have a lot of gook, it's very hard to clean that up chemically.
PoolDoc.
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