I agree, they are much to tight, not only that, but he does appear to be ribby.
It isn't about forcing him into a false frame - is it about encouraging him to engage his back end, lift his back, track up and drive into the bridle.
Many people use side reins incorreclty. They are meant to replace your hands - while you on the ground is meant to replace what you would be doing in the saddle.
He looks great! I really like his frame
His frame is very incorrect LacyLove. He is inverted, on the muscle, back is dropped, not tracking up, with hind end carried high. He is stiff and using all the incorrect muscles.
It isn't about forcing a frame...............
Side reins have to be used correctly, when used incorrectly - you are essentially going backwards instead of forward in training.
Your horse has to know how to remain at a steady fluid rhythm. You want to encourage their back end to move under them, you want to encourage tracking up, you want to encourage softness, suppleness. All the while, your horse not speeding up.
He has no topline, no hind end muscle. No balance, no ability to carry himself. I would take the side reins off all together, and just work on basic walk, trot, canter at a rhythmical pace.
Is he rideable? If so, I would get out on those trails and help him beef up that way as well.
Proper feed will also help with his physcial condition to become that well balanced, muscled up, centered horse :)
He is lovely, he has a big heart and has expressive eyes. He looks to be very intelligent as well. What a sweetheart :)