I usually don't use FD ever unless it's to get a general idea of how a new change is going to work, and that's because Zeherah is way faster at updating than the simc guys. The logic behind using Simulationcraft exclusively is frankly that simulation is better than formulation (meaning that FD tries to express everything with a spreadsheet, ie formulas, and simulationcraft basically runs thousands of unique simulations to get an average). Simc's model seems pretty solid for BM and RPPM, so I trust its results. Going from Crit > Haste to Haste > Crit nets me 1500 DPS as BM using simc. Stat weights are also here:
http://goo.gl/z5lBF
Overall there is definitely a noticeable difference in trinket uptimes, but it's hard to say whether or not I have noticed a DPS increase from the reforging. This is due to working within the margin of error, constant gear upgrades, and simple RNG.