In the closing paragraph, the most marketable names I've heard of are Kyatt as well as Graahk and Lurker. Other familiars may sell if given the right time or at a reasonable price but they'll almost all result in a small loss. There's RS gold not much in the way to make truly useful familiars below the Yip/tort stage and the majority of pouches go for around 50% of the price they were created for or lower. In other words, the best strategy to avoid loss is to make sure you don't waste time gathering items for the ones that make profit and make those that are quick, using the time that you have saved to and then recreate the loss.
It's true that this isn't exactly the kind of information that you're seeking. However, if someone knows some intricate method that I'm not familiar with, I'd love to hear about it. From my experience with these levels, it wound up being far more efficient to just pay the huge price tag instead of trying to scrape every bit of gp I could get out of the affair.
I'd have to say Eagle kite simply because CLS doesn't like it that much. Other than PvP it has pretty much no use, being outclassed by other equipment (usually more powerful rapier) regardless of the situation. Bandos can be buy OSRS GP argued that maul does more damage, and has a longer duration, but CLS lets you protect yourself by using a shield.