You're experiencing 2 very common things. Alot of horses stock up for one reason or another. 99.9% of the time the stocking up will go down with turn out or exercise. As you can already see that if you take him out on long rides, no stocking up, short rides (=less exercise) he'll stock up. Maybe if you lunge him for a while before taking him out on short rides he'll be less likely to stock up on ya.
As for the windpuffs. Those will not go away. They normally happen after a horse has experienced some sort of stress in that area. Maybe from a ride where he might have stepped funny or made quick turn or even just playing out in a pasture. They are nothing to worry about as long as its not accompanied with lameness or soreness.
From the Merck Veterinary Manual: These puffy, fluid-filled swellings around the fetlock joints (of either or both fore- and hindlimbs) usually are not accompanied by heat, pain, or lameness. They are said to be associated with trauma and hard exercise, but the exact pathogenesis is uncertain. Although usually benign, windgalls should be regarded with suspicion in the presence of lameness. Some horses, particularly heavy ones, seem to be more susceptible. Treatment is problematic; in the absence of lameness, it is unwarranted. Windgalls may disappear spontaneously or respond to periods of rest, bandaging, and exercise. Recurrence is common.
If you don't want to stand behind our soldiers who are in danger zones, please stand in front of one.
If you really open your ears and eyes, you will see that there is alot of great advice given on here. You just have to see it and hear it without closing off your mind.
VanHalen 26 yr QH Stallion R.I.P. 4/11/82 - 5/8/08 24 wonderful years together.
Scout 25-28 yr Paint/Draft Cross Gelding
Glistening 13 yr Arab/Saddlebred Mare