William, filler under the shot is the way to go. 16 and 20ga work the best. Any filler over the shot will blow the pattern having the effect of a spreader. Stick with the thin over the shot cards to keep your pattern, unless of course you want a spreader shell.
If you can get your hands on some SR7625 about 30 t0 32 grains of it is a good for 1 1/8 and it will take up more room than the 19.4 gr of Red Dot.
If your shot column is just a little bit short try adding a 1/2 or a whole cheerio as needed between the shot and filler wad you are using. Cheerios are plentiful and cheap, they last longer if you don't eat them while you are loading shells :-)
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