Can anyone elighten me about capture odds ie. the odds of successfully capturing a ship as an escort?

I had ultimate combat rating in a Cresc Warship (61 crew) + 4 turncoats (101 crew each) + 1 voinian frigate (364 crew) for a total of 930 crew in my fleet.

I get 75% odds on capturing heilans & aradas, and anywhere from 1% to 40% on capturing turncoats, crescent and Azdgari warships, an 1% to 10% for voinian capital ships.

Why do the odds differ between different examples of the same ship type?

I've seen somewhere that the odds relate to crew size and current shield rating (I take it to mean what percent shields/armour you have at the time).

I'd really like to know about this in a bit more detail.

TIA

Sly Simon

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foobar