The Credit One app was a misstep, like taking ten steps back 
No more apps, PLEASE especially do not apply for any more bottom feeder fee harvesting cards, you will thank yourself in the long run.Try to get it cancelled and permanently removed from reporting on cbr.
Already had Chase and a couple of solid builder accounts, Credit One should not have even been a consideration at all at that point, or ever really. There are always better options, like your Cap1s for e.g.
Uderstandable you were apparently going for a dilutional effect- building good accounts to lessen the impact of some neg history, which is a good strategy in general but in rebuilding, starting with up to 3 solid accounts (which you already have) is sufficient. Then garden watching credit profile improve over time before adding more. By doing so, will be granted higher limits and better terms when are again ready to app.
FP, Credit One, etc are expensive eye sores on a cbr that will not necessarily preclude an AMEX approval going forward but could bring AMEX pause for the PP reasons.
Enroll yourself in "retraining camp" resolving not to finance auto or other purchases beyond current means if wanting to build solid credit for the future and ultimately obtain the 0-1.99% auto financing that can be yours after strenthening profile. It will be well worth the wait.
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