Yes the Cadet and Major ports are quite long, which probably accounts for some of the low power.
Isn't the colander transfer port thing a design classic? For a designer to put that in, knowing that people would try all sorts of small things in the barrel, is brilliant! It is quite a surprise that the barrel is actually rifled.
As you probably know, the 4 guns I recommend as Plinkers are the Baikal IJ22 or 38, the Diana 25, the Webley Falcon and the Bsa Cadet.
The Baikal is a well built thing and I can even tolerate the barrel catch and anti bear trap--------but it is not quite as good as the others.
The Diana 25 (earlier, none safety, Milbro made one) is good (I bought a .22 one just before Christmas about 3 years ago) -------but that rear sight lets it down. A solid sight like the Gecado versions would be more durable.
The Webley Falcon is a bigger gun and I do like the cheap, but good rearsight on them. A rough Webley Falcon with a tired mainspring is the gun I plink with on Christmas Day
BUT there is just something about a plink with a Cadet and some cheap pellets that captures the essence of Plinking.