you do realize that once you get the hang of maneuvering the big ship, you just need to wait until your opponent is skilled enough to learn how to block them, range 1 them and for the Firespray, approach from its sides, and it's all back to square one again. I've spent the past 3 weeks flying the Slave I every single night with pretty much every single variation i could think off or have read online, and I have quickly came to the conclusion that unless you are flying in a empty 3x3 with about 4 opponent ships, you will be wasting a lot of turns doing subpar maneuvers and generally being a waste of 30+ points, going all "hey guys, i'm helping" awww so cute kinda useless waste of board space. in fact, it would be a lot more efficient if you were to divert those 30+ points to 2-3 other imperial ships, which will honestly nab you about the same amount of hp (spread across 2-3 ships, meaning you could have a bit more hp due to buffer if flying 3 ships or just about the same hp with 2 ships), and you get 2-3 attacks per turn as well, which makes up for the difference in firepower, even when you consider heavy laser cannon. Yes, the Firespray is a good ship when supported with other things as well, eg. squad leader, howlrunner etc, but the exact same thing goes as well if you are talking about the 2-3 ships you could field instead.
like after all that flying around with the Firespray, i expected myself to be some Firespray professional pilot, able to gauge accurately how it would fit between tight spaces between ships and asteroids etc, how to fly it around and get it exactly where I want it etc. I did get that, but by the 2nd week or so I discovered instead how to get at least 1 ship to fire at it from range 1-2 from its sides for nearly every turn or so, and how to generally tear it apart in 3-4 turns, avoid both mines, totally block its movements and action choices etcetc, and by the end of the 3rd week i simply given up all hope on this rubbish. Will I play this ship? definitely not in a 100 point match, nor a tournament, but for fun matches anywhere from 50-70 points against 2-3 ships, I could consider bringing it out for a spin. it is both great fun and utterly useless at the same time.
EDIT: if you ask me how I'd field it, I'd most likely throw out an empty bounty hunter, and I may or may not even consider a gunner upgrade depending on how badly i need those 5 points elsewhere. then point it exactly to the left or right and have it move horizontally until your opponent has reached, then swing in with a 90deg turn to catch somebody within range 1 of your front arc, then fly pass and catch somebody withint range 1 again with your rear arc, then have him stay in the middle and be a big irritating piece of plastic while you do actual stuff with the rest of your squad. if he is taking hits and dies, all the better, at least i know those hits didnt land on something else more important, like any TIE/in or some named TIE/ln