2PPCs (chainfire)
4 Medium Lasers (chainfire)
no jumping.

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another game got me 5 kills 6 assists and 744 damage (got me the "Johnny Five" Achievement with it too)
2 AC2s with 5 tons of ammo
4 medium lasers
As long as I had AC2 ammo I was using my Medium Lasers on Chainfire for "suppression fire"
Once the ammo was gone, I turned back to Group fire and did "hit and run" tactics
no jumpjets whatsoever.
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The blackjack is a very mobile suppression mech, as long as you can keep out of range and touch enemies with long rage weapons, the relatively thin chassis is great for keeping good cover.
What I dont like is I'm focused on most of the time due to being a medium, and being alone as larger mechs whimper and hide (on both sides mind you) as I lay DAKKA into the countryside.