30/7 (29/7 to be correct) kind typically gives you more $$. This is because you can actually have this with a day off in between the conflicting trips. So it may reach further into the new month and if you are less senior you may not hold lines that start on the the 1st. But now a days it is hard to find high blocking trips. You also have to watch it carefully and make sure all those 29h 01m is inside the 7 days. I.e. be aware of a red eye that goes LAS-FLL and only the first 30 min is on the day of departure. Ask me how I know...

The old recipe was:
After transition was adjusted, assuming the new month was dropped, drop the end of the old month while everyone is holding to the trips and it is green. Then pick up something a few days away from the transition area. Something that ends by the 27th-28th or so. This way you are free to pick up. Then make yourself AVL starting the 30th or so until the 5th. Rinse repeat. This is how I credited over 1400h credit with like 850h block and no more than 5 JRMs. I did that for several years. Of course none of this works anymore. There is no OT. You can't really drop then pick up that freely. Also the company got smarter building less lines with a conflict and shorter conflicts. And finally, the pilots got smarter. I used to be up against the old guys with their jitterbugs against my smart phone. Most did not even pay for alerts. Most never cared to read the contract either. It was easy to get a conflict every month. Now I get my ass beaten in FLICA most the time. All you new guys are wired in... I gave up plus I am reserve so I can't even pick up anyways.