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Apologies, I thought it was F9 too but its 127mm apo f7.5, so a bit faster than yours. And I am also shooting from an area of pretty high light pollution.
However with 4 minutes even at f9 i would expect better. Try iso 1600 and see what you get.
Since I am just a noob, another thing I do is I repeat the same sequence with different ISO so I think 1600 is the one I need, then I also do 10@800iso and 10@3200iso, and try stacking them, or even stacking all the different exposures together.
Hope it helps.
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