You might want to let Kevin from FPR know about your nib issues - he's pretty good with customer support! I've had issues from time to time with EF nibs (though the #6 EF I bought recently was great!), but the F and M nibs have always been good for me. The B nib is not much broader than the M, so that may be your best bet.
Will be interested to get your take on the ebonite vs acrylic materials - I have one ebonite 'version' of the pen, and 3 acrylics, but the ebonite is fairly new and I haven't paid sufficient attention to notice any difference in 'tactility'.
Kevin provides A+/superb customer service. You really feel like you're dealing with a solid company. Gives you that reassurance that FPR wants you to have the optimal writing experience for an affordable price.
I wanted to see how the Broad wrote first since I don't want him to spend extra money sending me a Fine when I may prefer a Broad, which is on the way, or Medium instead. I want to get my bearings.
I'm quite optimistic about the Broad fitting my preferences and if it has that same sturdy quality, presence of pleasant feedback I detected, but puts down a smooth line, I'll be very happy I think.
Besides the scratchiness of the nib, I actually think it is good quality for the money. It doesn't have that cheap feel to it like a Jinhao or a Wing Sung nib. The flow was excellent when I tried the Free pen I received (the Muft). If I received a nib like you reviewed I would be so happy. For the high functionality of the pen, the lovely design, sturdy build, and inclusion of a free pen that isn't (bleep) (which I love for some strange reason), I think FPR is worth trying.
FPR is definitely on my radar now, I think they have immense potential. I would love to see them make more alternative options for presently popular pens and their designs since they come with great acrylic, provide eyedropper options, and have ebonite feeds. I want them to compete harder in the market against popular models.