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First off, what test are you using for Ammonia? Research I did found that API's ammonia test will not work when Cupramine is being used because the test will provide false positives due to the chemistry of Cupramine. Not saying you don't have an ammonia issue; however, it may not be as bad as you are thinking.
Do you have a copper test so you can monitor levels of copper? Copper is a difficult approach for Ich because you have to maintain the copper which can be a nightmare when taking into account water changes and evaporation.
Pulling the copper out now will not benefit the fish because you are putting them through another change. I would say make sure you are using a test that will read the correct ammonia level, make sure you are testing copper levels, do water changes regularly and dose the proper amount of copper to the new water prior to adding it, and do NOT use Prime! There is a sticky labelled something along the lines of hospital lethal or something that explains it. If you did add it already with the Cupramine you may want to do a rather large water change to remove the possible side effects of mixing them. Then use the copper test to determine how much Copper needs added to keep you in the correct level. A lot of people prefer tank transfer method to avoid all of this and that way Prime and other ammonia aid can be utilized if even necessary since the fish are only in water for less than 72 hours (well and there is not the stress of using copper.
You do have the intention of leaving them out of the display tank for 72 days so you don't introduce them into an environment with it possibly still in it correct?
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