Big fan of bi-weave shields on my combat ships.
With any other type of shield, it's
always a countdown until you lose your shield and then you have to retreat and either sit around like a shag on a rock, or visit a station, to recharge them.
With bi-weaves, proper pip management (by which, I basically mean putting 4 pips to sys whenever you're not shooting stuff) and a bit of evasive flying means you can remain in a fight indefinitely.
By way of comparison, my Corvette has a 7C bi-weave with 4200mj (including Guardian SBs and regular SBs) and has a recharge time of 6 minutes.
If I swap it for a Prismatic shield I get 6,600mj but the recharge time is
FIFTY MINUTES.
When I'm fighting in CZs I do, sometimes, get down to one ring of shield (usually as a result of doing hard-headed stuff) but then I can ease off, pick easier fights and my shield will recharge without me having to leave the fight.
If I had a Prismatic shield I would, basically, get to do that twice and then I'd be forced to retreat while my shield recharges.
"But... SCB's!!!???"
Nope.
SCB's provide a finite amount of energy and they only do it once.
I used to have 2x 7A SCB's fitted to my 'vette and each use would barely half-fill a ring of shield.
They don't do a good job of restoring a big shield and they only delay the inevitable trip back to a station to recharge your shield
and SCB's.
Far better to use a bi-weave - for
any type of combat - and know that you can keep it charged with a combination of evasive flying and pip management.
As for how to deal with large numbers of attackers, I think
@GunnerBill makes a good point about taking out
any targets of opportunity as quickly as possible.
You might be up against, say, an Annie, a couple of FdLs and a bunch of Eagles and Cobras.
You might
want to take out the Annie or the FdLs first but if an Eagle or Cobra gets into your sights, target it and explode it and it won't bother you any more.
Any ship that's capable of taking on large numbers of attackers
should also be capable of exploding things like Eagles and Cobras in a few seconds.
In the few seconds it takes you to destroy an Eagle or Cobra, the Annie or FdLs aren't going to do a lot of damage to
you but if you can explode a smaller ship, you're improving the odds against you for the rest of the fight.
Basically, just get in there and shoot anything that has a red box around it.
If your current target is proving difficult to hit, and there's something else shooting at you, target the new threat and try and explode that instead.