The Liberty costs: 4000 - Hull + Shield 5670 HP
The 80b costs: 4500 - Hull + Shield 11.625 HP
Any comparison of any unit with the MC80 or the ISDI for that matter is, to my mind, kind of pointless. Any unit's going to seem like it's overpowered or more useful compared to those two, and there's not really much price adjustment we can do to fix that. If it were entirely up to me, I'd have neither the ISDI nor the MC80 in the mod but it's one of those things where as a SW mod there's certain aspects of the 'verse that have to be represented in a certain way. The only consideration is whether the other units are in line relative to each other, and I don't think the MC80B has a problem here.
You bring up the MC80B/MC90 comparison:
MC90 : costs: 6800 - Hull + Shields 10.238 HP
You surely have to add in this comparision the weaponpower too:
MC90 - damage about 840 per round
MC80b - damage about 512 per round
Maybe here is any point i dont know/see about?
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First off, the stats I have for the MC80B put it at 10125 for total health, including shields. The MC90 has 10565. KEep in mind that the health values in the unit aren't what matters, it's the hardpoint values.
Also, your stats for firepower are based on salvo, not damage per second which is the more important stat. You could do 100,000 damage in one salvo but if it only happens once every ten minutes that still ends up being kind of negligible (salvos can only go through one target so the cap on effectiveness is basically just the remaining health of whatever's being attacked). Based on the stats we have recorded, the MC90 is 208 DPS against about 128 for the MC80B. Neither of which exceed even a Victory Star Destroyer, let alone an ISD.