I found the FdL too vulnerable until I fitted 5A Shields w/ 2x 0A + 1x 0B Shield Booster.
Since the Internals are so limited, the 4A Cell bank is the best you can get.
I have no complaints about it's ability to weather fire with the 555MJ provided by a D5 gen and 1x A + 2x C boosters:
[video=youtube;oZAJtXtnq84]https://www.youtube.com/watch?v=oZAJtXtnq84[/video]
[video=youtube;PQRCFB_v9nM]https://www.youtube.com/watch?v=PQRCFB_v9nM[/video]
Or if you prefer PvE...
[video=youtube;DCRejFkOmns]https://www.youtube.com/watch?v=DCRejFkOmns[/video]
[video=youtube;XpwQH6ipvfM]https://www.youtube.com/watch?v=XpwQH6ipvfM[/video]
[video=youtube;-MX4Y3YgKRo]https://www.youtube.com/watch?v=-MX4Y3YgKRo[/video]
There is no situation where you would want under powered shields on a combat build for a ship as big as the FDL. If you lose your shields, the change in regen rate isn't going to make the massive hull damage and component loss you will suffer any easier to bare.
Here is an explorer test build I was running through trials in a CZ:
[video=youtube;okIh8t0NGFY]https://www.youtube.com/watch?v=okIh8t0NGFY[/video]
I did make a few mistakes and lost my shields in the process, and I stuck around until they were back up. I could have waited a bit longer and allowed them to restore even if I had a 5A, but the situation could easily have been different; there are times when every second counts.
You may as well shift to super cruise instead, since nothing can stop you.
Except, that unless I want to abandon the fight all together, I can't come back without exploiting the SC shield recharge oversight, which I will not do as a mater of principle.
I'm using my FdL in a RES mainly; all minor differences and it mainly caters for differing play styles.
Good food for thought, thanks!
Definitely room for differences in preference. However, I build my ships around the need to combat other CMDRs, often while outnumbered, and even something as simple as flipping off a module is easy to botch, or can take too much time, in the heat of combat. I need to be able to concentrate on fighting while watching my opponents and my sensors. I've been tempted by, and trialed, many more complex setups, but I always go back to having everything I will need in a fight always enabled, with no fiddling.