Since you have the BW I will assume you are not hero adverse. To that end I enjoy bringing an Ilya with 3AC10s or 3LBX plus 2ML (the lbx build only on a second or fourth wave). I also like my IV-4 with 2 AC10s (you can make it work with a std 250 or go XL for more ammo and 2ML in ct). Before you scoff at that IV-4 -that 30% cool down plus armor quirks makes this thing pretty dang lethal.
Any Jagger, but in the hero spirit I like my Firebrand (doesn't need to be a Firebrand obviously but what the heck) with 2AC10 2ML std 270 build, but your 3UAC5 DD build is more satisfying.
For a lighter mech (sorry not a hero) I like the BJ with AC20 and 3ML or a 1x with 8spl and a std 280; the latter only on caustic defense for work around the cannon. The 8spl are a bit hot but if you are dodging around the buildings you have plenty of moments of cooling time.
You're T1 so these might not be your cup of tea...that is to say I recognize there are some better builds with these chassis that a better player might be able to make more optimal use out of, but these work for me and more importantly I have fun with them.
Edited by Bud Crue, 01 June 2016 - 12:41 PM.