But sometimes too many links can be detrimental. There needs to be enough text too, to justify them
Not really at all.
Look at this write up about Alan Alda in wikipedia. There are 24 links to Wikipedia in the first tab.
Make sure you arent duplicating too much in the same post. For example, do not like price each time you use price. I would do it once. But every term that can be linked, do it.
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Yep, I stopped adding double links a while ago, unless maybe if I have very few links in the post (which hasn't happened in a while) and maybe with a slightly different text the second one.