When I'm running as a BA, the biggest thing I fear are (in this order):
1. facing 2 opponents
2. other BA
3. 'Mech flamers
4. LBX weapons
5. MGs and RACs
6. PPCs (splash)
As has been mentioned, you can't rebalance a game around lag, especially at this early stage. I stand by my advice about safety in numbers and using team tactics to offset the speed/agility/size of BA antagonists. When I'm running as a BA, I usually die when more than 1 opponent decides I need to be taken out. One-on-one against most 'Mechs, I'll be able to survive for a while so long as the loadout of the 'Mech is in my favour. As soon as I have to keep track of 2 enemies I'm inevitably going to turn my back at the wrong time or run out of JJ at an inopportune moment, usually resulting in me turning into a fine red mist.
All of the above said, I believe that BA are still not particularly fearsome for the damage they put out, it's how they can pinpoint it and dance out of the way when faced with a single (lumbering) foe. The fox does really well against the bear, up until point where the bear has a buddy show up.
So, get a buddy to "help you with an itchy back" an you'll be OK and the BA will be dead.