Scenario 1:
Typical Range zero attack on cloaked War Eagle
"Effective range" is therefore 5 (calculated as (displayed range*2) + 5)
No attack shift
Overloaded DisruptorHit% is based on the effective range of 5, which is 83% thanks to UIM.
Base damage is also based on the effective range of 5, which is 6.
This damage then passes through 2.5.4.12 cloak chart...
33% do 6 (full damage)
33% do 3 (half damage)
33% do 1 (quarter damage)
Yup, you can do more damage to yourself in feedback (2) than you do to the War Eagle (1).
Your average damage output with an OL Disruptor is 2.77 vs a cloaked target accounting for hit%.
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Scenario 2:
Range 0 attack
Effective range is 5.
No attack shift
Overloaded PhotonHit% is based on effective range of 5, which is 50%.
Base damage is based on effective range (moot point, photons are not attenuated, OL's do 16).
Damage then passes though cloak chart...
33% do 16
33% do 8
33% do 4
So you can do the same damage to yourself in feedback(4) as you do to the target(4). Ouch.
Your average damage output with an OL Photon is 4.66 vs a cloaked target accounting for hit%.
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Scenario 3:
Range 2.0 attack
Effective range is 9.0 (i.e. 2*2 + 5)
No attack shift
Overloaded DisruptorHit% is based on effective range of 9.0. However, there is no resolution for a Range 9 overloaded weapon. Therefore they always miss. This applies to Hellbores and Photons too. So you can't avoid OL Photon feedback (0 to 1.9) if you want to hit the target! Getting closer than range 1.9 for these weapons provides no bonus.
Phaser-1's should be fired at 0.49 or less to get the excellent range 5 column results. Firing at 0.5 to 1.9 is resolved on the weaker range 6-8 column. Ph-2's and 3's don't matter much vs cloak. They are resolved on the tepid 4-8 column in even the best situation. Phaser damage must then pass though the clloak chart.
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Ph-1 @ Effective Range 5Full, Half, Quarter
5, 2, 1
4, 2, 1
4, 2, 1
3, 2, 0
3, 1, 0
2, 1, 0
Average = 1.89
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Ph-2 @ Effective Range 5Full, Half, Quarter
3, 1, 0
2, 1, 0
1, 0, 0
1, 0, 0
0, 0, 0
0, 0, 0
Average = 0.5
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Ph-3 @ Effective Range 5Full, Half, Quarter
1, 0, 0
1, 0, 0
0, 0, 0
0, 0, 0
0, 0, 0
0, 0, 0
Average = 0.11
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Fusion @ Effective range 5Full, Half, Quarter
4, 2, 1
3, 1, 0
2, 1, 0
1, 0, 0
1, 0, 0
0, 0, 0
Average = 0.88
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Overloaded Fusion @ Effective range 5Full, Half, Quarter
6, 3, 1
4, 2, 1
3, 1, 0
1, 0, 0
1, 0, 0
0, 0, 0
Average = 1
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If you allow the target to have an ECM advantage, then things are going to be very futile for you. A cloaked ship with 6 ECM and EM is going to be very hard to hit (+2 shift) with anything. However, it takes a tremendous amount of energy to do all that, typically 32 for a CA! So the flash and tractor may be your best friend (and consequently, a Romulan's greatest concern).
The cloak is clearly a useful device rather than another self-destruct button, as some say