I would expect this to be mostly a form issue (ie: OAT).
C-PD maybe. Definitely not the S-PD or P-PD for a FH flex. They'll turn over too much. At the range he's talking about I wouldn't suggest it. The C-PD is a shorter FH driver (anywhere from 250-350ish) for me.
If you're looking for a flex shot my choice would definitely be an STAR Xcaliber. All reports I've heard of champion plastic Xcals have been negative. I threw the Xcal for my primary FH distance driver for almost two years, and it worked pretty well for me (I was using it for 350-450 foot lines if the space was given to me). In the beginning I used it for the flex shots you are talking about, but after much use I began having to flip it on max D lines or flat for ones a little shorter. I want to be clear that this took about 8 months of heavy abuse for it to get to that point though (2+ rounds a day for that time period).
The Force is very similar to the Xcaliber. I threw it for a while, but it never felt quite right and I ended up going back to the Xcaliber.
A couple weeks ago I started to throw Destroyers instead of Xcalibers. I started doing this because I realized that I was applying a sizable amount of OAT to get the disc to fly the lines I wanted. This was really messing up my shorter FH lines with the C/S-PD. I tried the Destroyer and quickly found I could hit the same lines and about the same distances as my Xcaliber with two added benefits. First, it didn't fade out nearly as hard. Second, it took about 75% power to get the shot a 95% shot with the Xcal had taken, translating to more control; however, I do not throw flex shots anymore, so take that with a grain of salt. I'm not sure that they'd be as good for a flex shot at as long of a range.
I have not thrown a Boss, but I would expect it to be similar to the Destroyer, with the added effect of being faster and everything that usually comes along with added speed, including inconsistency.
I hope you enjoyed my mini-novel.
