If you don't have the PAC2 and don't have Charged Armor, here's an alternative build (ship 5 is a countermeasure ship). Can do a 60-set for about 1:30 in damage, and without the HIC would probably be about 2:30.
Ironclads are strong, hardy ships but eventually Kixeye will find a way to promote the buccaneer and hydra thus making the ironclad obsolete in raid. The same way they put the mega stun in the assault cycle to make apollos impossible in higher tiers and the slow in the skirmish cycle to make hell wraiths impossible in higher tiers.
https://www.dahippo.com/bp/ship#!C07M012121212342U6P2Y8OAKAK2M2M2M2M2M2M2M2M07J012121212342U6P2Y8OAKAK2M2M2M2M2M2M2M2M07J012121212342U6P2Y8OAKAK2M2M2M2M2M2M2M2M07J012121212342U6P2Y8OAKAK2M2M2M2M2M2M2M2M07J01212121234446P006AAKAK2C00F2281B1B1B1BdE
C1-CR isn't a waste on Clads, it's actually fairly decent.