Hmm, so, have you tried this build? Cause anything above two LLAS incurrs the heat penalty. Shooting five of them...can you do it without shutdown nowadays? I may be wrong but I don't think so.
I've shot 5 LL on mordor, and it got to 90% heat as for the UAC5, a good gun to cool down with after a HUGE heat penalty alpha strike.
Interesting, I have used a 3 LLAS Victor lately (as you know) and I thought five was near impossible now. Hm.
if you have 16+DHS, then you can get away with 1 alpha from a cool mech. 18 is good, 20 is better, and so on.
Now you must fire LLas in chain and not more 2 at the same time. But you can make an alpha and hide next with this build. It depend of the situation.
Groups of 2, brothers. Still epic damage. I run 4xLL on a couple builds. It just allows you to fire off an 18 point shot every ~1.5 seconds. (a little over 1.5) However, no heat penalty, just group 'em in twos. Still gets hot, though. So, as Vergere says, "Run cool-shot, my friends."