Which ones would you recommend over SP-445 for daylight processing? And what kind of issues are you having with film loading? Lining the sheet up at first or finishing off so it's in correct position before tank is closed?
If you want ease of loading, can accept that inversion isn't the only way to agitate, and don't mind needing a LOT of solution to cover your film (but you can process up to a dozen sheets in the same volume -- ideal for replenishment) the Yankee Agitank is still available new, and it's
cheap. They're about $35 new, but you can usually find them on eBay for under $20 (make sure the film loading gate piece is present, it's a big help in getting the film in the same position on both edges), sold by folks who didn't like them. It adjusts for (once-)common film sizes from 2x3 up to 4x5 (doesn't need an additional film holder set for 9x12, for instance), fills about as fast as the SP-445 (even with almost 4x the solution), drains just a little slower than it fills (and can splash a bit when draining). Agitation is by sliding sharply, end to end, or by rocking in the same direction (the feet are designed to allow about 15 degrees of tilt either way, which produces nice, even negatives in my experience); I prefer rocking, but Kodak has recommended sliding for similar tanks in the past. The inside parts are so smooth, I think you'd have to work to scratch a negative in this thing.
Downsides: it's made of bakelite (yes, even in 2020) so it's a little brittle; drop a piece from the counter to a hard floor, it may break (but it's so cheap, you can just buy another one -- whole set costs less than a film holder for SP-445), it's easy to misload the film, with edges in different slots (i.e. top edge in slot 3, bottom in slot 2 or 4), easily worked around by leaving an empty slot between loaded ones if you're processing up to 6 sheets, and the top doesn't latch in place in any way -- in fact, if you overfill the tank a little, the pressure underneath can actually
lift the lid a little bit (though not enough to cause fogging, in my experience); you also need to hold the lid in place when you drain the tank, else it'll at least threaten to take a tumble (a rubber band or two around the tank will help here). Also, if you overfill for 4x5, there's no airspace left, resulting in little enough liquid movement during agitation to reduce the contrast of your negatives slightly. Takes 1630 ml (=55 US fluid ounces) for 4x5, not 1830 as I tried to give it. If overfilled, it can also slop solution onto your counter top (if you develop in a proper darkroom sink, that's no problem, of course). Probably not economically ideal if you're using low dilution one-shot developers (Xtol or D-76 1+1, for instance, or HC-110 Dilution B), though if you're processing a dozen sheets, it's not much worse than single-loaded 120 for volume efficiency.
Since I've been replenishing Xtol for a few months now, I don't mind needing a lot of tank solution to process a few sheets -- I only "use up" the same 70 ml per four sheets of 4x5 that I would in an SP-445 or SP-8x10. And if I have a
bunch to process, there's no arguing with being able to do a dozen sheets in the same 20+ minutes, dry to hanging, that I'd need for one. I haven't attempted to load the tank with damp carriers (and I can think of several reasons not to try) but the slots in the negative carriers are wide enough and smooth enough that I wouldn't expect big problems loading stiff 4x5 film even if the tank hasn't had time to fully dry (very different from Paterson type reels for 120 or 35mm).
