Realistic Fusion Engine rebalance

Realistic Fusion Engine rebalance:

As discussed elsewhere, Fusion engines on mechs are disproportionally good to the point that there is no incentive to use any other of the several engine types. They are lighter, safer (having no explosive fuel), and even cheaper than most alternatives (including Fission Engines).

A possible solution is very simple:

Make Fusion engine generate tremendous amount of base heat (at least 10 each turn for integrated heatsink balance; can shut down to cool and not receive this +10 per turn penalty). This means that having the mech powered up would generate 10 heat per turn, enough to negate the integrated engine heatsinks (in non DHS models). Walking and running, umjets, and of course firing, would all generate additional heat to this base amount.

This allows to not change loadouts in theory to apply the rule, and also serves as a laser nerf, since most stock mechs will be overheated except if using ammo-dependent (particulaly AC) weapons.

Plus, it's realistic that fusion engines of small size are tremendously heat inefficient when generating electrical power.

This can be combined with the "integrated heatsinks are also single heatsinks" to negate the disproportional double heatsink advantage.

Secondary considerations
DPS would fall dramatically on mechs depending on energy weapons. Then again, this fall would make them roughly proportional to all-ballistic weapon mechs.