Ken, I do see your point on the bill shape. Respectfully, though, the balance of features overwhelmingly favors Red-shouldered Hawk (RSHA) over Snail Kite (SNKI). Butty and Tom have already presented some important points, which I can only add to somewhat.
The dark throat I feel is very important and can't be put down to a photo artefact. Looking through many photos of SNKI, that species' pale cream to buffy throat stands out in all but the worst of lighting. I also support what they've said about barred secondaries, which I haven't found in SNKI (I think your linked photos showed barred coverts above the secondaries). The rest of the underpart pattern is right for Florida RSHA and not SNKI. Most RSHA have a messy pattern of streaks below, often fading to a near-whitish belly. SNKI markings are "Van Gogh"-like, heavy and long, and almost always reach at least to the legs with limited fading. Sibley's illustrations show the difference between the two species well. From what I can see in the OP's photos, the undertail is more or less pale throughout. Most SNKI have a well-visible pale base and dark outer half, but one can find many photos with variation so it's more of a minor supporting detail.
Finally, I see the point about photo angle and primary projection vs tail length. I don't think the OP's bird can be reconciled with SNKI, though, even accounting for that. Here are a couple of Macaulay Library photos to illustrate some points:
Macaulay Library ML211081651; © Peter Fang/ Gloria Smith; Lee, Florida, United States
macaulaylibrary.org
This angle is not too dissimilar to the second image given in the OP's second set of photos (post #19). The pale throat is obvious, and the wings easily reach the tail tip at the very least. This is one of those photos where you could argue that the tail doesn't show a prominent dark outer half.
Macaulay Library ML194924451; © LynnErla Beegle; Volusia, Florida, United States
macaulaylibrary.org
This photo is also at a similar angle to the OP's photos. Even though the wingtips may appear to fall just short of the tail tips, the angle doesn't hide the fact that the ratio of tail length to primary projection is much more in SNKI than in RSHA.