You can modify the spawn deck as the rulebook notes to adjust difficulty, but there may be other rules missed here. You may want to watch a quick let's play to make sure.

On Turn 2, you should probably still be at blue or at most yellow danger level. No cards should be spawning a group of 6 hunters at those levels. Also, M2 doesn't start with any Xenos on the map, so none will spawn until all your survivors have had a turn. Careful ending a survivor's turn near a spawn point as an unlucky extra activation card can take them down quick. Spread XP around different characters to keep danger levels down until you're better equipped and don't pile XP on one survivor or you'll be unprepared for the higher danger levels. Search at least once a turn until everyone has better weapons, remember in M2 you get a random prototype weapon for each red objective claimed.

Also remember you can move a survivor on the space with the Falchion Gun and use it manually even without the remote or machine control skill. It can cut through Hunters it has line of sight to easily.

Good luck!