Doctor thinks my E is too high

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I've been on HRT for 6 months, with 5mg weekly injections for the last 3 of those months.
3 months ago, my E was 22 pg/ml, now it is 333 pg/ml.
Doctor says that is too high and is going to to reduce me to a "maintenance dose". Just wanted to check with other people if this is consistent with their experiences. Thanks!