Sorc bomb video from one year ago;
Click here to watch on YouTube
either with tactics like
Int - cd decrease on IW - possibly IW/SP extender - possibly Frozen Fury - most likely morale pump if you running organized wb - maybe Close Quarters if you feel like enemy allows you to cast 1.5s casts with ease (eventually stopped trying as no good enemy will let you freecast at their backline)
spec, AoE tree kinda maxed out, then either left tree for ID or midtree for fluffdmg IS boost and crap Gon (prefer ID for fast buildup and good finisher on low health enemy bombers)
max crit with renown, rest max Int for max dmg - you don't spec for defences, your tank and healer are your defence & situational awareness.
warm up in a fight by spamming IS all over the place, try to get everyone dotted. If enemy pretty damn slow, maybe throw in BH/GoN for fun, otherwise keep warming them with IW and IS. Once meleetrains clash, you move close enough to be able to cast DC and SP effectively, while possibly shooting out a Silence at enemy healer line if possible - SK has long CD, and takes long, so max 1-2 ticks out of it before you end up using another SP or launching another IW. Try pick low health targets, maybe shoot ID on them so they die for sure, get mechanic up for more SP uses.
If fight lasts over 50-60 sec, use the M4 for unbreakable morale root + 1800 aoe dmg, preferably coordinated with 3-5 other bomb sorcs.
M2, either FM if you feel like enemy somehow allows you get solid amount of SS out without too many interruptions, but if they clever enough they will not allow you to do such long casting, but make you waste 2-5 sec trying to get a single spell launched, meaning you could have used something like SP, IS, IW, DC already meanwhile to get actual dmg out. Otherwise WWS is actually pretty good morale in many fights - it's out fast, and assuming your party plays well enough, a -20% reduction in dmg may just turn the tables in your sides favour (stacking with Challenges ofc)
The most important thing is to have a tank with brains hugging you all the time so you don't die, and 2-8 healers throwing hots at all the Sorcs in the warband so they can keep doing dmg without dying.
Also, dps zealot for aoe corp debuff and BO for aoe corp debuff stack, effectively debuffing your enemies corp resis by +500, meaning all your corp dmg doing spells will be doing far more dmg due to lower enemy resis.