If you are going second, it might be a good idea to not deploy on the board.
Also, raiders are best taken cheap. Give them one, maybe two upgrades and be done. The only upgrade I recommend with no reservations is the flicker field. A 5++ save is really good, especially if you go second and don't get to turbo boost.
If your opponent has a large amount of long range fire power, you need to take more than 3 transports. In modern 40k, I don't expect 3 rhinos to make it across the board, its a bit unlikely that 3 open topped AV 10 vehicles would be able to survive. So going second, start out off the board (regular reserves), or take more.
If you do webway, I recommend only using units that are fast from it. Like hellions and beast packs. Wyches can work, but have shorter assault range, and warriors aren't all that good out of a webway.
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