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Not really, to be honest. But then again, that is part of the purpose of sandable primers. On a project where that stuff is really important, I may sand and reprime some seams a few times to get it right. I think I primed my latest ship hull 5 times. This is why picking a good primer is so important, as it both makes the sanding easier but also doesn't over-fill the details in the process.

I'd also use different putties for this purpose than those. Squadron White is my usual poison, though I'm looking for something a bit smoother with longer working time. Gunze "Mr Putty" is ok, but starts to skin over WAY too fast. I occasionally use green stuff, but only when I am filling in larger areas or spots that I think will need the flexibility.

Strangely enough, the glue can also make a difference. I've gone almost exclusively to Tamiya Extra-thin, which has really reduced a lot of the thinner gaps. If you do it right, it squishes out a very small bead of plastic that fills in the gap and gives a much easier seam to fill. But GW kits do need a lot more of this kind of work than other stuff. It would also pay dividends to improve your clamping tools and methods.

I have a jar of Mr Surfacer myself, haven't figured out how to use it yet. All I keep doing is ruining brushes. What kind of solvent does it need?

You may also want to try the Gunze Pre-Thinned putty, they call it "Mr Dissolved Putty", or the Tamiya Basic Gray. Milliput should also be available in Japan, haven't used it myself though.

RedStripe, I do use automotive primers myself sometimes. Just try to get the ones that say "Primer" and not "High-Build" or "Primer-Filler". To be honest though, unless I'm having adhesion problems I go straight to Tamiya paints from my airbrush to do the basecoating. Gives me better control, less filling, and more color choices.