Hi, I sometimes run a similar list @1850pts, Lias, 3 full Tactical squads with all grav and 7 lotd squads of 5 (4 squads from the LOTD codex detachment), each with a multi melta, melta gun & combi grav. Lots of fun, struggles with objectives sometimes due to lacking mobility.
So i'd suggest trading out the heavy bolters for Grav Cannons in the tactical squads, use small squads of 5 LOTD, I really like the melta route & combi grav, hits hard vs tanks and does okay vs most other heavy stuff. The combi melta instead of the combi grav has some merits though.
Id definitely trade in the dev squad, for some scout squads in landspeeder storms, gives you more infiltrators and mobility for objective taking. Finally, an Inquisitor, with servo skulls really helps stop enemy infiltrators!
LOTD imo, are a really underestimated part of the SM codex, Lias fits perfectly with them.
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