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As a datapoint for you I just recently got an increase on my cloc from $500 to $15k with a 637 EQ(my lowest). 2 paid derogs on my CR & heavy usage on my CC's due to having to put medical bills on them recently to avoid collections. It took them 2 days due to a computer glitch online & it wound up costing me 2 EQ hard pulls in 2 days, but it was worth it imo for a nice increase just before I garden.
I'd say go for it imo.
Edit: The model they used for me was EQ with a range between 334-818. My EQ was 656 in that model. Disregard the 637 above I quoted.
So i sent them a message asking if I could use that same pull and request a higher limit. NOPE! Thats one thing about NFCU I dont like, they pull for everything. LOC, Credit Card, Personal Loan, Car Loan, for the hell of it credit.... They dont care. Not sure why they dont just combine all the different departments. But otherwise they are good CU. I will wait a little while, possibly next year, and then request the full 15k. My inquiries from NFCU are at 5 on EQ for this year alone. SHEESH!