At the old house, when the drain hose was in a tight u, I would find water on the floor. I pulled the washer 6-8” away from the wall, no more overflow.

turbulance?

You didn't reference what kind of washer but making a guess on it, the drain hose looks like a WP or KM direct-drive machine. Those have a very fast pump-out rate, they can drain much as 25 to 27 gallons in a bit less than 2 minutes. Higher flow rate than a garden hose.

Thanks for the helpful feedback. It's a Kenmore Model 92574800 Top Load Washing Machine.

I'm leaning towards snaking the drainpipe, as, based on feedback, it seems it could still have a clog, given the fast pump-out rate.

The washer at the old house was a large capacity top loader kenmore, IIRC, 51 gal of water per load.

In addition to snaking the pipe, can you check the vent.

The full model is 110.92574800. The leading 110. is part of it, and also indicates the machine is sourced from Whirlpool.

We had the same problem when we had a top loader washer. We found out that the drain pipe was plugged and had to snake it out at least once a year. Eventually bought a front loader washer and since it uses less water, we have not had the overflow problem for four years. When we had to rent the snake for the drain pipe, the man at the store told us to pour bleach down the drain at least once a month.....we used chloryx. That helped a lot, so you might try that after you have your drain pipe cleaned.

What diameter pipe is the standpipe and the rest of the drain?

The old standard was 1.5" drain which is insufficient for newer washers. 2" drain is now the standard.

Yeah, look at that drain pipe. It looks small. If it is, you could convert to a laundry sink.

Here’s the other thread along with some pictures of the rubber caps I tried.

https://www.gardenweb.com/discussions/5637109/speed-queen-drain-hose-question-top-load#n=32

Your stand pipe is not large enough. Newer washing machines pump real, real fast. Code used to be a 1.5" stand pipe. Nowadays it is 2", and in some localities they want a 3" drain line(yeah a bit overkill IMO but you see the point).

How far out does the 1.5" run? Does it empty into a stack nearby or join a larger drain line as part of a group?

The OP's machine is not a "newer" washer. It's a design produced from 1981 to 2010, old-style agitator, full-fill tub. Looking at the parts diagram, it may date to the mid/late 1990s. The pump is driven directly by the main motor that also runs the transmission. It does pump out quite fast. I worked for a Whirlpool dealer when the design was introduced, a change from the design Whirlpool had produced since the late 1940s. It wasn't unusual that the drain overflowed when we delivered and tested one of these new-at-the-time models (early/mid 1980s) to a customer who had an older machine.

New frontloaders and HE toploaders today have a small electric pump, separate from the motor that drives the drum or wash impeller. They typically drain slower than the OP's machine, and there's also less total volume of water involved.