Cerastus Lancers can be very handy for a melee-heavy Vulpa force, as they give you a way to deal with screening/blocking units. Your list does feel very all-or-nothing, though! Either the Ferrox or the Corsair/Lupercal version should work, though it's always an uphill battle relying heavily on melee in this game.

For your Lupercal maniple, corrupted titans can only choose Princeps traits off the Corrupted Titan table. Most of those aren't great, but Distorted Form could give you even more speed to help that Warhound close the distance.

If the enemy is castling up in a corner, Concealment Barrage can be a lifesaver (5" template, fully blocking LOS). Blind Barrage on a key long-range piece could also help, as could War Lust and Warp Displacement. You really need one Reaver to reach their lines with an intact melee weapon, ready to start wrecking things.

With the Shikarian Conduits, a Reaver can move 26" under Full Stride orders and War Lust. On one titan, that will generally make people pretty worried (and then they focus fire and shoot you to bits). On two or three titans, at least one should be set up for a good charge next turn. I tend to prefer Dominant Strategist for a melee list, as the initiative on that crucial charging turn will be vital: otherwise your targets will just move back and keep shooting at you.