During the course of preparing No.3 in my "Top Tips" series ...
https://forums.frontier.co.uk/showthread.php/341107-Truesilver-s-Top-Tips-No-3-Gimballed-Duelling
... I found a FdL with 5 x gimballed lasers to perform better in Engineered PvP duelling than expected. Their lower DPS than multis is made up for to some extent by lack of reload time, but more importantly by the fact that a gimballed laser will almost always hit a shielded target (even a small one) at more or less any range or angle, whereas beyond 2 km a vast proportion of multi bullets can miss.
...and also, when they chaff, you can just deselect the target and have three slightly-worse fixed pulses for a while. Harder to pull off with MCs.
I've been playing with this for a while after I got fed up with my MC-based FdL continually running out of ammo. I like to hunt at compromised nav beacons (lots of high-ranked small ships). My current setup uses one huge and two medium gimballed pulses (gimbals because I like to fight close-in and the extra fire arc is useful), and 2 MCs (one corrosive) for killing hulls. It worked well, except that I sometimes didn't have the burst DPS to overwhelm a big ship's shield cell. If I go hunting at a HazRez, I might switch in efficient PAs for the MCs to give me some more punch.