The full-length rifle is just fine, and it is NOT a clumsy or difficult-to-use length. For my tastes, I avoid the shorter versions.
My rifle is also a 9222 carbon-steel/walnut loaded model, and it is about perfect right out of the box. Absolutely reliable, and more accurate than I am, it has become a favorite in just one year and believe me, it has a LOT of competition for that honor around our house.
The one thing I usually change in all my M1/M1A rifles is the size of the rear-sight aperture. After fifty-odd years of using iron sights, I know very well what works for me, and the issue diameter is too small for efficient FIELD (not target) use. I open the aperture to at least twice the issue size, and gain in field of view, speed of picking-up targets, and better light transmission in less than ideal conditions. I've actually USED the rifles on bear-defence chores and as home defence weaponry, and the larger apertures add greatly to the utility of the rifles.
Recently, I adapted an M1 Garand sight to accept a Merit "hunting"-size adjustable-iris aperture, and this may be the best way to go. On some rifles, the Merit might interfere with getting a correct short-range zero, as it may contact the receiver before the sight reaches dead bottom. In such a case, a taller front sight will correct the difficulty. These comments also apply to the M1A, because the sights are identical.
Apart from that, the M1A rifle is great.