Deflection shields:
Cruisers: 200 kill 1 lvl, none die
HC's: 80 kill 1 lvl, none die
Taking down P-Shields in one shot:
Cruisers: 1920 to kill each level, none die
HC's: 384 to kill each level, none die
Killing a set of P-Rings:
Cruisers: 437 to kill each level, 305 die (61000)
HC's: 155 to kill each level, 151 die (75500)
How to kill p.rings - - Assassin Style:
Take the cruisers you need to kill the p.rings (Cruisers: 437 to kill each level) plus the following minimum of each ship per level of p.rings:
800 Fighters
800 Bombers
360 Corvettes
180 Destroyers
This will drop your losses to roughly 35k per p.ring lvl