The toes need to be brought back further - RF more than LF. Because the soles are already too thin, absolutely NO trimming of the soles for any reason. I can't tell for sure but the heels are also likely to be somewhat underrun so need to be left alone, as his HPA is broken back, with a palmer angle that is too low. This is exacerbating his ringbone as well as putting pressure on the tendons and ligaments. Both feet are slightly laterally high, flaring medially to compensate.
Having a current set of hoof photos would help with making more specific suggestions as well as providing mark-ups if you want them.
Jan 2005, RI