With a additional lump sum it would be reasonable to start afresh/separately with that money, average in according to relative valuations at the time.
If on having loaded all-in more usually there's no need to sell back out again such as at a apparent high, as often today's ceiling can become tomorrows floor. Once loaded in at a reasonable/fair/low price there's no need to look to further average that down at the risk of perhaps losing the already locked in benefits.
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