I think a few large, fully grown out LPS pieces can really complete the look of a tank. If you were to remove them I think you'd be shocked at how empty your tank would suddenly look, and it would stay that way for months while something else grew in.
If you want to see how you feel about it, you can always just put those guys in a bucket for a while then stand back and look at your tank. If you feel like that creates too much a hole, there's nothing stopping you from putting some or all of them back.
The only caution I would give would be that you know how big these things can get and how much volume their tentacles occupy at this size now. If you frag them so you've got much smaller specimens in their place then load up the now emptied space with SPS, you're only a few months away from those LPS posing a real threat to what you've added in their place.
My euphyllia's that have grown up to close to that size are in the process of destroying encrusted acros and montis that I can't move out of their way.
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