Not sure how your tactical squads are going to work. They do not fit into a razorback. Then leaving a 24'' gun at the back is a bit silly.
I am not sure you are getting value for money for your venerable status. You have to assume they will die after they have shot.
Odd number of drop pods is always the thing to strive for. The exception being the number zero.
But the other units could work in a list

. How about three tactical squads 1 flamer, combiflamer, multimelta and 2melta, combimelta, multimelta all in a rhinos. Then a
AoBR dread in a drop pod. Then you may be able to find room for the classic suicidal landspeeders.
To make it clear the three proposed tact. squads can roll with the landraider and can shoot form the rhinos. One drop pod can land and destroy the biggest tank around. You lack some antiinfantry so will be relying on rapid firing your bolters and land speeders deciding not to die.