I am not very good at this, but I managed to find a sneaky transit by trying a new (for me) tactic based on folding a spectra as tight as possible and then side scrolling and looking for dips. I haven't read anything similar, so decided to share it here. But it still fails on multiple occasions, when the dips are hidden in the noise.
The tactic I used was
1) Locate a dip that is most likely a transit. If you are wrong the dip will be off-centre when you side scroll later, making it harder but not impossible to spot it.
2) Fold to the smallest possible (0.5 days) and start scrolling sideways (by at least +0.5 days, to 1.0 days orbital period, to allow everything a chance to line up) while looking for overlapping dips. Dips with a longer or shorter orbital period will have noise mixed in, so pay extra attention to the lower half of the spectra as you do this. If you are unsure about a dip, try looking at it with the double orbital period to see if it is still there (write down the epoch and orbital period if you think you might loose track of it).
3) Sometimes a tightly folded spectra can look like a zig-zagging wave, I believe this is a recurring pattern that is caused by the sun itself and this should not be mistaken for a transit.
Some work in progress pics I took on the 200075050 spectra
(I noticed that this is the exact same spectra as Bienator II posted above, post 153)
a) Messy spectra, I can't see any dips
b) Zoomed in and looked around, found a possible dip that I decided to work on. If I am wrong, the dip will be off-centre, but it will still show up.
c) Folded at 0.5 days length (the smallest possible) and started scrolling to the right, looking pretty flat at first
d) What do we have here?
e) Last pic before submit
f) This time it was a success. But I still have many failures