Greetings,
Your question is a little confusing, let me see if we can help.
Bomb Loads are a determined by two things, the mass of your fighter and thrust of the unit.
One bomb for every five tons of mass
-1 MP for each 5 bombs.
The Jump Bomber is a light bomber designed to carry a small load and get to the target very fast. The previous Aerotech rules were not well written and did allow carrying loads much heavier than they should have been able to.
Best,
Joel BC