Your plan separates all your units which will leave them all vulnerable.
With Vulkan at this low points cost should be 1)get assault termies into combat or at least make the enemy spend lots of resources stopping them 2)get all your units into melta and flamer range, 3)Use
rifledreads or some ranged shooting to stop enemy attempts to block steps 1 and 2, 4)?, 5)profit.
The 'raider in particular has a lot resting on it and you only give it a rhino as a distraction going forward.
5 men with a
ML and dread do not make happy bed fellows either.
The vindi relies on short range firepower-you have that in meltas and flamers what the master crafted guns can not give you however is long range fire support which is where your
rifledread comes in.
I would suggest 3 rhinos, but even razorbacks or vindis, just send so much stuff forward with the raider the enemy has a huge problem.
Welcome back and good luck