that looks like some grand daddy purple that i got! tall with little side shoots, next time you should lst it, it helps a lot, when i do it i get like 3 main big colas and a whole bunch of side buds. its the only way to maximize the yeild on purps. but ya that strands character genetics grow like that. hope it turns purp tho, cause like yourself i got the seed from bagseed granddaddy and 1 out of 5 showed purple, but it all tasted almost the same. also it wont show purple if it does have those genetics till almost end of flowering. nice job on mounting your diy fans! looks very very clean!