I did it mom!
I used a mix of Stewster's and Balantine's strategies, as well as my own standard N1 harvest strategy.
I started by making a large group near the bottom, and rushing them in when the two tiger beetles were away to get the nearest food (set to no combat). I established two groups of 7 workers for this that were in one pheromone with the starting workers, totaling at 21 by the end, with 4 in the nest to handle respawns and various building jobs. I then went for the food guarded by the ants on the second lowest, and upper levels, ending with the highest level's tiger beetle food, and the seeds south of the nest.
From here I made spitters and took on the larvae in the west, while one of my teams of 7 workers I upped to 10 and sent out to collect the food to the south where tiger beetles usually patrol (set to no combat), abusing the fact that the crabs are slow. I also dug a small tunnel around to the food storage, where the ants could use it while the crabs would go a different way (this way I had constant supply during an attack, while otherwise they'd get stuck on crabs and die; this saved me for the final wave).
I did the recommended strat, and as the second crab of wave 1 was dying I took on the group of enemies directly south of the nest.
I beat wave 3 with something like 20 combat workers and 14 rapid fire spitters. I also gradually expanded my non-combat workers to ensure I had a steady flow of tanks.
Spent the entire next day combining all harvesting groups and going out to collect all the food possible.
The N1 harvest team spend N2 collecting food from underground, as I opened those up between the waves of wolf spiders (excluding the last wave, which was too much of a risk).
Repeated the day strat, harvesting most of the beach and then losing 45 soldiers and 50 workers due to not anticipating the fast tide. I went conservative with my spending and bunkered down with something like 120 workers, including 13 in my down-time harvesting team, around 60 in my melee team, and around 50 in my nest team. I also had 70 soldiers, of which over 60 were spitters with something like 5 lvl 3 and 5 lvl 2, and about 5 warriors I made for kicks. The spiders can threaten worker counts, so I'd recommend setting any harvesting group you have off in a faraway chamber until mid-way through the battle, even if you already emptied the underground. They're also best fought underground where, if you build your nest well, many of them will be possible to fire upon from the queen, allowing you to gradually kill them off.
N3 wave 2 I still had a load of crabs around by the time of wave 3. The spiderlings also killed my framerate, as there's an enormous amount of them with 2 of the enormous mother spiders. No crash though, fortunately, but if you're likely to lag significantly I'd recommend preemptively placing the pheromone on the queen so that you don't need to move it during a lag-spike that prevents you from acting.
