I found with salamanders that you needed extra resilance in the transport formations for the troops, otherwise they lose a rhino and either slow down or abandon troops. I got it by having - for tacticals say - 3 rhinos then adding up to two other vehicles, typically a hunter and a land raider, which did not subtract a rhino.
Maybe you need something similar, either the upgrade being Rhinos then a separate upgrade for Land Raiders. Or several fixed formations.
Say the following formations which can then take upgrades
4 Berserkers + 2 Rhinos + 1 Land Raider + 1 Predator
6 Berserkers + 2 Dreadnaughts + Dreadclaw, (drop formation)
8 Berserkers (foot formation)
Okay so you might not like the numbers
8 is a magic number don't you know!
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