I am not going to lie, I don't know much about the Reba forks (never owned one) BUT blowing through travel when the sag is set properly is USUALLY compression ... otherwise, it's just doing things the fork was not meant to handle (bigger drops, basically). If NOTHING changed with your fork and you were to magically get another 20mm of travel, I bet you'd STILL blow through all the travel due to not having enough compression damping. Also, you need to consider that increasing fork travel adds a LOT of extra load to your headtube. You don't have to search for very long to find video of a headtube ripping off; it's generally a really bad accident. It's completely possible your frame is rated to a 160mm fork, but I would almost guarantee that is WAY beyond it's design, ESPECIALLY for "aggressive" riding.
If your fork can adjust compression, you might want to increase it a little when you're thinking of beating on the bike a bit more. If you can't adjust it, then you probably need to change the oil weights (like I do with my Fox Van R) ... probably a really easy process.