AX missile are better, in solo runs with 3x AXMC i did an average 850 k cr per run, swapped to 3x AX Missiles and now each run is an average 1.3 M cr.
I use a single 2D Beam LR/TV to stay cold as ice even in silent run mode.
My tactic is simple,
START: When you reach the edge of the asteroid field, you can see the Titan Heat Vent, activate Silent Running and move straight to the Titan, use the Beam LR/TV to avoid overheat, stealth approach...
stay in Silent Run and use Beam while waiting the vent opening, as soon the vent open, turn off silent running and start the bomb run.
THE RUN: During the bomb run do not worry about heating up so: boost, aim vent, torpedo away, boost to next, repeat... alone i do 6 of 8 with a Krait Mk2, better pilots of me can complete all eight, i think.
hint: do no boost direct to next vent, instead aim with a bit offset so you can drift for an easier aim/torpedo and avoid collisions, with of without flight assist off, anyway the boost will give you the right "momentum".
As soon you see the next vent close (no smoke and vent folded) or hit all eight, move under the Titan, do NOT wait the message.
THE STRIKE: Next is the opportunity window on the "pineapple" heart, initially i used the AXMC and an Heat Sink was necessary to dissipate the heat, but... with 3x Missile Rack and 1x Beam TV the heat is no more an issue, when the titan heart retact you are at near zero heat and ready to boost away to avoid the titan retaliation.
i used a Krait Mk2 with 3x AX Missile 1x Beam LR/TV and 1x NanTorpedo, you can use 4x AX Missile for extra damage but i prefer the silent run "safe mode" with LR/TV Beam "support".
RECOVERY TIME: during the titan "angry phase", prepare for next run! Use a Repair Limpet as soon the hull have few % point of damage, do not wait, repair over time even while moving and striking the titan, and use an AFMU while getting in position for next run.
my 2 cents