825 effective hp vs. 780 effctive hp.
LRM with 19.5 dps (against target) and 780 hp against disciple with 6 dps (also against target) and 825 hp.
Assuming the degree of shield mitigation affects both ships more or less equally, then the LRM will kill the disciple more than 3 times faster. Or, to put it more quantitatively, the disciple will deal approximately 240 damage to the LRM by the time it's been iced. Do the math and we find that one TEC LRM can actually match 2 disciples at the same time, and ice both of them with like 60 HP left.
Shield mitigation probably tips things a bit in the disciples favor though. Disciples have a much lower damage per volley, so it's going to take longer for them to bump up a LRMs shield mitigation. So I bet in a real world fight the two disciples are going to barely come out on top, but one of them is definitely dead, and the other one is going to be hurting. However... You can build a lot more of them. A -LOT- more of them. Faster build time, you start building sooner, no research required, no military lab required...
I'm glad you found an advent counter for early game LRM spamming. But once crystal production steps up in the mid game and the LRM spammer comes closer to matching your ship per ship production I'm guessing this would drop off fast. Basically you're capitalizing on the fact that the LRM-er is going to make his move before he reaches that point. So, awesome. But it's not a function of unit stats, it's a function of economics. The shield/hp/dps values of the disciple are more or less irrelevant, the only relevant fact is that you can build a shitload more of them by the time the average LRM-er gets ready to attack. It might be worthwhile to try out spamming seeker ships instead. They will deal the same damage to a LRM, they have the same HP, and they will take much less damage. Granted the disadvantage of this is that you wouldn't have a prayer of taking the fight to him, as anti-light damage does almost nothing to structures. But, you've countered his fleet for a fraction of the cost, so...
But, all of that having been said...
Thanks.