hey bud.
I'm not exactly sure what scale it was, I think around 1.42 or 1.52, something in there. You may check out the thread I started for that build. It was almost a year ago now, but I can say that I used stealth's Dancinfool modified files for the chest and back, and mostly JFCustom's for the rest. I'd have to go back on a windows computer to see the exact scale, because I used different people's files for different parts of the suit. I know I scaled everything down at least 10% (using the scale factor, not the automatic 10% increments) from the original size. The originals pretty much fit a 6' tall person supposedly, but I'm 5'11'' and found them all to be too big for my taste. That being said, I could have scaled the chest up another 2.5-5% bigger.
Another thing to note is that most of JF's files start at a 1.65 scale factor (I believe), but some don't. The way I figured my scaling was to print things out on a sturdy cardstock first and build the piece to see if it fit my body. It's a pain in the neck, but it's really the only way to see if it will fit your body like you want it to, as far as I know. If you were to only use JFCustom's files for the entire suit, it may turn out a little bubbly or big looking if you don't customize it to your body. I LOVE his files and am so thankful for them, but when it is simplified for foam, you lose certain angularity and details that you must come back and create yourself. This isn't a bad thing, and not even necessary at all if you don't mind the simplicity. Overall, you will have an amazing suit either way.
I took a decidedly complicated approach to my scaling, using different folks' files for different parts of the suit, but overall it worked well. I just liked the look of certain versions better. When files are altered, tiny details are altered, and even subtle changes can end up affecting the overall look. In hindsight, I feel it's important to keep the scaling as close as possible throughout the suit, and stick to maybe one or two sources for your files.