The only other thing i believe elevation should play a part in, is that the character in the lower elevation should suffer accuracy penalties on attacks at characters in higher elevations.
Good form and practice overcomes accuracy penalties from both low and high ground. The first time you practice shooing from an elevated or lower position you'll probably shoot high with each. With practice you can be as accurate shooting uphill or very close to shooting on level terrain. With practice and good form you can be more accurate from an elevated position than level ground, maybe because less arc idk really know why. However I still struggle with good form shooting at a steep downward angle as maintaining the 'perfect T" and only bending at the waist is tough (for an older guy) but those shots are rare in reality. Damage is less from low ground and more from elevated ground IRL. Gravity really plays a surprising factor in projectile speed.
