1. The areas where the defects are reappearing have not been worked enough or they are too deep for DAPS attachment to remove with a drill. Possibly needing to go with an actual dual action polisher to get better results.
2. With the DAPS, it needs to be held at a certain angle to have it work properly. The defects could be an issue with refining your technique with the DA drill attachment.
3. The towels are causing these defects when removing NXT. It is known as towel marring.
4. Has the area been repainted? The reason I ask is because repainted areas behave differently than factory paint.
Nick can elaborate a little more on this. I am giving you the non technical description.
I agree with Guz in his recommendation to use some kind of a quick detailer spray if possible when you are wiping the vehicle down. Also, if you aren't already doing this, be sure to switch to a clean part of the towel often. Otherwise you may be trapping dirt in your towel and scratching the paint with that. Since you said the scratches that are reappearing aren't deep, I'm wondering if perhaps this is what's happening. If it was a matter of polishing oils and NXT wax filling the scratches, I guess I'm surprised that the effects would go away that quickly.
Also, like he mentioned, wiping the paint carefully with isopropyl alcohol after using Ultimate Polish is a good way to make sure the swirls are indeed gone. I wouldn't necessarily wipe the whole vehicle down with it, but maybe do a portion to get a better idea of what you're working with. Be careful to use a soft cloth for this also to avoid marring the paint. I would personally recommend isopropyl alcohol diluted 1 part alcohol to 9 parts water. I'm not sure how IPA is sold where you are but here in the states it's sold diluted a few different ways so you may have to do some math to get it diluted to roughly 10%.
When you said they are reappearing, are the swirls reappearing or does it appear to be individual deeper scratches? I think the most important thing is to find out whether these are old scratches that are reappearing or whether they are new scratches. Then you can go about addressing the issue.
Your English is excellent, by the way!
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Geeky: OT, but you don't have to apologize for your English. You write better than 98% of people on the internet!
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You need a degrease spray to eliminate any polishing residue that can temporarily mask very fine imperfections.
1, sonax paint prepare / finish control is an aerosol based degrease / cleaning spray potent enough to strip sealant, wax contaminants and any polishing residuals. Great stuff but expensive.
2, menzerna top inspection is a simple , clear watery degrease spray .
And keep in mind, polish contain oils, which is greasy and can easily contaminate your MF towels.
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