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The image scale is good for your refractor and oversampled for your reflector (though not heavily). You could try 2x2 software binning for the latter setup. But also relevant is your typical seeing at your imaging site. A general rule of thumb is to try and get the image scale at somewhere between half and a third of your average seeing. If it is way 2 arcsec then aim for an image scale in the range of 0.7 to 1 arcsec/px (roughly). Most sites are a bit worse, however, so something in the range of 0.9 to 1.5 is usually great.
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