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I just pulled new scores. Could not resist the 25% off coupon.
Anyway, here are the results - see below. My reports have: 11 accounts, 3 accounts reporting (1 CC, 1 car loan, 1 mortgage), AAoA 9 years, 1% utility. Last time I pulled, I got dinged by TU for not having any CCs report. Today, EQ is not happy with the inquiry I got last month when I opened up my ING electric orange checking account. Oh well, I love the onling checking...
So, for my best scores, I must have at least 1 CC report, but not more than 2 CCs report. My sweet spot for utility seems to be between 1% and 4%. Just my experience, YMMV.