I'm using EonTimer. The parents I deposited were x/x/x/31/31/x (A) and x/x/x/x/31/31 (B), so the closest flawless special spread that works for them is on frame 28284, which is over 7 minutes further than the one I was aiming for on standard spreads (frame 2391).Honestly, I can't really help you there. I've had a lot of experience with all three spreads on both retail and emulator. I have no idea what triggers it, but I would go for the alternate spread if you can. They are usually earlier in the frames than the regular ones are, so you can have more tries in less time. Are you timing with a stopwatch?
I'm doing it on a cart. Thanks though!If you're doing this on emulator, you can generate a list of frames that will give you your target spread (both for Normal and Alternate), and then check each frame using Save States. It's time consuming, but it works.
Otherwise, stick to what Thomaz suggested.
Best of luck :)