long story involving the GRE and MS-Stat program

#1
OK, here's my story, followed by my question. I am an assistant professor in a health-related discipline at a land-grant research university in the U.S. For a number of reasons, I've decided to apply as a part-time student to a Master of Statistics program at the institution where I work (yay for free tuition). I have always loved statistics, but felt limited by my mathematical abilities. I always thought I was "bad at math", but have recently come to believe this was a situation of my own creation. So, to remedy this, I have completely restarted my collegiate math curriculum in my spare time. So far, I have taken Calc I-II-II, linear algebra, and probability, with A's in all, except for a B in Calc III (got too busy at work). Starting this week, I will be taking (undergrad) courses in statistical inference and number theory. I have also just finished teaching an introductory-level statistics course to my own department's students, and I think I pulled it off rather well.

So here's my problem... I decided to take the GRE (again, 10 years after I first took it) as a good-faith gesture to the Statistics department. I didn't want them to think I assumed I could just walk onto the program via my professional status as a faculty member. I didn't even need to take it again, according to the university's graduate school rules, since I already have a PhD. Unfortunately, I did assume I could just waltz into the GRE testing site and bang out a superlative score without any preparation: I got a 720 Verbal, but only 600 Quantitative. During the test, I only managed to get through 21 of the 30 Quant questions... I scored 660 Quantitative when I took it 10 years ago, and you'd think having a half-dozen math classes within this last year would've improved that! (Note that decade-old score was too old to be reported by ETS.) The statistics department's website (to which I'm applying to) mentions that competitive candidates have a 700+ Quantitative score.

My question is: do I spend another $150 and retake the GRE with better preparation and hope for a higher quantitative score, or just stand on my other credentials and stop worrying about it? I do feel rather foolish to be in my position and yet still be worrying about admission into grad school, and you can be sure I'll not be a hard-ass when it comes to judging my own department's applicants!
 

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Ninja say what!?!
#2
I've always believed that its easier getting in if you are already in the University than to apply from the outside. My advice is that you are fine and over-worrying yourself.