Inspired by TonnageLimitByMissionDifficulty, Drop Ton Limit, DropCostPerMech mods. This mod will based on mission difficulty, reward cbill if you send lance tonnage below the mission difficulty level, and also limit on how overpower your lance tonnage allowed. The objective is to tilt the lance tonnage within -1 full skull and +1 full skull of the mission difficulty.

Current setting of difficultyLimitAllowance=2, means that you allowed to overpower one full skull, increase this value for higher tonnage. Once the calculation reach 5 skulls, there will be no tonnage limit, good if you play with bigger drop mod. The tonnage limit will also double if you somehow facing Clan in certain mod.
Current reward is set to 2% for each ton lesser than mission difficulty, up to 50 ton or one full skull lower.

mod json setting:
        "rewardOnDropTonnage" : true,       // cbill reward if send lance tonnage below mission difficulty
        "limitOnDropTonnage" : true,           // limit the max lance tonnage, set to false if not your preference
        "costOnDropTonnage" : false,         // pay extra cost if lance tonnage allowed to be above the limit
        "rewardPercentagePerTon" : 2,       // percentage of contract payment be rewarded, for each tonnage less than mission difficulty
        "maxRewardPercentage" : 100,      // max percentage of contract payment be rewarded
        "difficultyCostPerTon" : 500,           // cost for every tonnage that above the limit
        "difficultyLimitAllowance" : 2          // how much difficulty higher than mission difficulty allowed, unlimited if calculation reach 5 skulls

still compatible with other mods like DropCostPerMech.

Requires ModTek, and thanks to Mpstark.
Thanks to TonnageLimitByMissionDifficulty, Drop Ton Limit, and DropCostPerMech mods.