Don't know a lot about fishing deep there, but, we do it all the time down here, the 100lb mono will have way too much stretch with that weight, you will feel it like a rubber band, the TLD will be OK, but damn hard work, how big is your Alvey? I would think about spooling it with braid. Definitely look for structure, you might see fish, but we fish drop off/cliff face type of bottom.