LOL .. not wanting to be offensive or anything, but Lifeforce isn't massive. He's progressing well which is down to his own hard work, and growing because of that. He doesn't half-ass his workouts and keeps trying to beat the logbook. His progress is what, 10kg in two years? Not bad, but you can gain that sort of muscular weight in two or three months if you really hammer the food and the logbook. This is NOT to discredit his hard work or anything, he got out what he put in and kudos to him - but it's impossible to compare genetics unless you both do the same program and follow the same diet, etc.
Yes, I reckon you'll progress on this program because you just posted your problem - long, complicated routines. There's no way I'd progress on what you posted, no way in hell, in either strength or size.
Get some more dumbbells, worth the investment. The more weight you have means the more muscle you can potentially gain.
Barbell rows - I don't believe there's anything that'll give you a thicker back than heavy deadlifts, but if you prefer barbell rows then do them, still a solid exercise. Watch your form though, overhand grip, knees slightly bent, body as close to parallel to the ground as possible, your arms are just the hooks, you lift with your back.
im just average sized now (maybe a bit broader on shoulders for most guys my height and age) but its much nicer to be this way than skinny.