Here a couple things that seem to work pretty well:
Rend Armor > Follow Through > Arc of Destruction > Crushing Blow/Patron Blast > Follow Through. Requires a lot of recharge in follow through, but VERY good damage (at the cost of endurance.)
AoD > Follow Through > Rend Armor > Crushing Blow > Follow Through. Similar to the last one, but requires slightly less recharge.
If you do not have the recharge to run two follow throughs per momentum, I'd substitute a whirling smash.
TW/Elec Optimization
TW/Elec here at 50. I've been running the incarnate trials, and finding myself defaulting to a 4 smite attack chain: Defensive Sweep> Rend Armor> Arc of Destruction> Whirling Smash - rinse and repeat. I haven't used Titan Sweep, Crushing Blow and Follow Through in a while. With Momentum's slow(picky?) mechanic, there's just not a sweet spot I've found that can chain other attacks better. I would have liked to add Mu for more AOE, but TW is tight for slots. Can any experts share their opinions?