You are supposed to turn off auto-collect and keep using the limit increase spell. Use manual collect and make sure the limit is so high that your generators can't fill it up at all. Usually that takes about an hour or 2 of set up time, just to get the limit high enough
Cruncher reduces your overall generator, removing the 2x bonus from having 25 generator, so if you crunch it 1st time, it takes 2^4=16x out and give you 100x
A 2nd crunch removes 200 generators, so 256x for 100x, as long as you can get back to 50+ generators, you will have more income
A 3rd crunch removes 300 generators, so that's 4096x for 100x, as long as you can buy back 150 generators, you will have more income
Just make sure to do a little math and calculate the breakeven before doing the crunch. If you have a lot of starting bonus, (like tier 4 gen, and their 160+ starting bonus), you might want to reconsider crunching as you might not be able to get as many back
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