I have a similar problem, partially because I'm a contractor who does whatever comes along, partially because I've never dedicated in one direction or the other.
I keep two resumes. Well, six actually, but for this discussion two is appropriate, as the rest is mostly formatting. One is development heavy and the other is administration heavy. This is perfectly legal, since neither lies about what I've done, I just omit different duties that don't lend themselves towards the job I'm looking to interview for.
When they ask you about the administrative duties, answer their question then steer the conversation back towards positions where you were more heavily involved in development.
Never stop learning, even if it hurts. Ego bruises are practically mandatory as you learn unless you've never risked enough to make a mistake.
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