Let's Make a Melee and Ranged Fighter

[Anthrowhale]

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A difficult point here is CR20 monsters where you might want to deal 205 damage against AC36.

The ranged attack might be +37=20(base)+8(dex)+4(feats)+5(enhance) for an attack routine of +37/+37/+32/+27/+22 implying an expected 4.2=1.05+1.05+0.95+0.7+0.45 hits suggesting the hits need to deal 49 damage. If you have (4.5(base)+12 (strength)+5(enhance))x2(splitting)=43 is close---you can probably get there with some extra elemental damage.

Melee is generally easier since strength drives attack rolls, Headlong Rush subs for splitting, and your base & strength damage increases.

Overall, it seems to check out.