Nice tiles! Perhaps take another reading or try with another hydrometer. Unless you planned on making an incredibly high alcohol beer, 1.49 sounds really high. Many imperial stouts and barleywines are around 1.104.
Yeah, a target gravity would be good to know. It also may take a batch or two to figure out how to get a high yield out of mashing with your setup. If you are a few points off, it is no big deal.