Make sure you have not installed them backwards. Like you said the main reason is for MC which are mounted low. I have also used them in a non boosted system where bore was minimized and stroke was maximized for brake force. In this system the residual pressure valves kept just a little less on my stroke which gave me a just a little more available stroke if you will.
If you have adequate booster and are not using the entire stroke my vote is you probably don't need them.
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