im 6 foot 2 and i have a terrible time putting mass on in my legs, yeah they are in shape and have cuts but the mass in just not there.
What inseam pants do you wear? I'm a 34. Also, how big do your quads measure? They may be bigger than you think but look small because they are so long. Remember, Arnold, the greatest bber ever and was one of the most massive bbers ever in his era (second only to the much smoother Sergio and Arnold was much more developed than Louie), had 28" quads. So 25" is pretty big for a non pro or recreational lifter. I think quads are too big now and distracts from functional ability. 30+ quads for a guy 5'10" is the norm now.