In terms of agility or acceleration the kraits are nowhere near the fdl. Pilots have made very precise measurements about most ships, measurements that correspond to characteristics not stated in the game's pitch/yaw/roll triplet or maneuverability. You will have to fly each ship.Right yes, I've had more luck with rails for smaller ships than PA's but its still pretty tricky to get the timing on em, easy with focused PA's though, that faster shot makes a hell of a lot of difference, when swatting mosquitos!
Ah, frag cannons, I've not tried those yet either, I'm guessing a larger damage radius that is enough to get the small ships, and good for damaging the big ones, if your up close and get the with the entire content of the volley.
I'm concerned by the lower maneuverability of the mk ii, but that said I've not yet really tried it, and my current use of the phantoms extra maneuverability is really limited by my access to the pips. I'm thinking of growing another thumb, to resolve this issue!
I'm intrigued to learn about how a krait matches up with an FDL, I am very aware of how one type of craft can take advantage over the entire field, given engineering and environment constraints. But I can not not see those extra pips for maneuverability of the FDL in the ship management section, I kind of wonder just how close the krait phantom with G5 dirty drag drives, or other, gets to the maneuverability of the FDL, or to that extra blue level in the maneuverability scale in that ships spec section.
For example the fdl seems to fly well both in faon and faoff but that's less true for the kraits or viper mk4. In fact the viper mk4 is so agile in faoff during boost that there should be a new set of measures for it.
fdl is very agile to begin with, but during boost it is something else entirely.
You should search the forums, there have been long and in depth discussions on this subject. With the changes to engineering mats you should have no problem experimenting with many setups and figure out what's best for you. This is a great time ! There are various pvp, ax, racer groups on discord with incredibly knowledgeable pilots who will mentor you (like Newton's Gambit).
Good luck !