Mamba as the torpedo boat is an interesting choice, but maybe good old Krait MKII would be better when you want to both torp the vents and damage the core? Maybe even Krait Phantom due to its 580+ m/s boost speed, if 2 large AXMC-s are enough to damage the core?
I was at the Titan in my AX Krait, because the description of the torpedo pylons read as if I needed additional weaponry too, and the Mamba didn't seem the right fit for that, and also there are no small nanite pylons.
I didn't know what to expect (I didn't read anything or watch any footage when I first went to the Titan), so I equipped it with two caustic sinks, the Titan pulse nuetralizer and the pulse xeno scanner thingie (totally useless). In terms of weaponry I decided to keep the two large Azimuth AXMCs and the large TV beam on top and replace both my shard cannons with torpedo pylons - again, totally useless, one medium pylon is more than enough at this stage. I couldn't re-outfit my ship as I was too far from my carrier, so I went with it.
My solo run wasn't very long, and I had trouble finding the vents at first so I only managed to disrupt two of them, but my two AXMCs seemed to do some fair damage to the core - I think I stripped down like 15 percent or so in the ten seconds exposure I got. The TV beam fired at the Titan surface helped keeping me cold and escaping various attacks from the aggro'ed environment.
So, once I get back to my carrier, I think I'd modfy the outfit of the Krait as follows: Ditch the Xeno pulse scanner for a heasink, and store one of the medium pylons. Either replace the large TV on top with a smaller one in the mediums in favor for another large MC on the top. Or just replace one pylon with a medium Azimuth MC - I don't have a third large Azimuth MC for the top.
In general, tough and tanky seems the way to go at the Titan, but keep in mind you have to get there. I had no issue with the Krait, mine permaboosts to 530 with two pips (it brings 3k armor and repair facilities I didn't use - making it lighter would make it faster). The Krait made the trip through the caustic pretty quickly, it cost me four and a half caustic sinks (out of two ammo engineered ones I brought), i.e. I had to dump caustic sinks twice during the trip.
For damaging the cores, bringing as much AXMC damage as possible seems the way to go.