I still haven't done produce 2 carrots or produce 2 carrots and 2 saltpeter because I don't want to delete like 30 alchemists to make room for a couple farms.
I was debating whether or not to do them, but I got 2 farms for free in GE which were sitting in inventory. The next time I had 2 expansions to put down I was able to rearrange just enough to put them both down (they are 4x5) and started doing the 2 carrots RQ. 2 weeks later I had won 2 more farms. I needed to do a redesign anyway and put a couple of special buildings back into inventory, so I planned it out to first get all 4 farms down, then once I got the diamonds sell the farms to replace them with Alchs.
The 2nd, maybe 3rd time I collected from all 4 farms, the 2 carrots RQ gave me diamonds, so the next day I started running the combo which paid off the first day. It happened so fast, the farms barely got any use. They were quickly replaced by 8 more Alchs and I haven't looked back.
I'm glad I did it the way I did, I'm not sure how I'd feel if I had to tear down Alchs to get it done. I think if I everything all stocked up and ready to move, and that was the absolute last thing to do before moving to LMA, I'd take out whatever Alchs I needed to replace with whatever farms I had in inventory and make the jump as soon as the second set of diamonds came in.
It's rare to get diamonds from 'Research 2 Tech'. I never have. With a 1 in 14 chance, I've run out of tech pairs to unlock before the diamonds hit. I still haven't gotten diamonds from the 'Spend 38 FPs' RQ, I'll run it only when I'm doing a big drop on a GB. I spend at least that many FPs every day, but I'd have to leave it up all day to hit it. Then I'd lose the 3 'Collect coins' I currently complete leaving that one up all day instead.
'Spend FPs' and 'Gather supplies' I plan to leave until I'm ready to age up and my CF is at level 10. First I'll switch to 'Spend FPs' and only lose the 3 coin RQs, Once that pays diamonds, I'll do 'Gather supplies' with the Alchs set to whatever time lets me complete the most each day. As soon as the diamonds are in, off to LMA.