If it helps at all, you can pause your streak safely at any level where you gain a chest, so you can do it in batches of 5 wins without any counting as a defeat. (5/10/13/15/18/20/25/30 wins are all safe to pause and leave the app after attaining, its only the intermediate levels you can't leave during). I'd suggest mixing streaking with gemming for plunder points if you were already planning on gemming the wins, should chests be a concern. Gem out a batch of five battles during a rumble, let the 3330 points help out the guild, and get the next tier of chest. You can still win for fairly cheap in the low 400s, where you get 666 for a win; not as cheap as the 1 gem sniping battles down at PR1, but its an option that kind of splits the difference. Another option, if your guild doesn't rumble every day, is to streak on days when you aren't rumbling, and then get your rank back up for the rumble, jumping up and down in rank depending on your guild's schedule. Something other players I know do is go to a lower rank, get a bunch of easy wins/chests at the start of the rumble to get the streak started, and then climb up in rank and fight higher ranks with your streak bonuses. The first couple battles won't count for much, but after your streak gets going to a decent level, you'll be at a PR where you get nice points, with a grog and hire time reduction and some perks to help out!