Denon DA 307 and DA 309

Yeah, only tracking force, sorry 

I use all Stanton and Pickering with brush and all of them are fine and the sound is fantastic with recommended settings of VTA w/ brush. 

your custom made racks are very nice, they look solid, stainless steel? or aluminum?

thanks, it's steel filled with sand, painted

Use the screws @luisma31
DA-401 is much better tonearm BTW, but i think the mounting style is the same, look at my Denon on PD-444

the DA 401 is an arm dedicated to light cartridges therefore only moving magnet.

No, look at this Denon catalog, this is DA-401 tonearm with MC cartridge DL-303

This tonearm goes with two different counterweights for MM or MC and can be used with both types of cartridges.

Here you will find it with classic DL-103 series (higher compliance version for sure). 

Yes, the difference between XSV/3000 and XSV/3000-SP is compliance, the SP is lower compliance 15cu vs. 30cu for XSV/3000. So the tracking force is higher for SP version (2g is recommended, read the manual). 

I always do what the manufacturer recommends first and use my gear according to that. Mr. Walter Stanton explained very well why there is a brush on his cartridges, some people are happy using fluid dampers instead (not every cartridge have a brush like Stanton/Pickering).

After installing the 3000SP with headshell provided courtesy of @chakster

Sounds completely different than with the DL302-II, much much better, playing stairway to heaven from modern not so great pressing, imaging and sound stage is very good, it has the coherence my very good digital lacks playing rock, highs a little rolled off but I'm not doing any loading...

That Pickering XSV/3000SP is great, glad you like it.

Load it at 100k and you will hear the highs and air you're looking for. 

Higher models of Pickering are more refined. 

The trick is to set up the VTF right with the brush. 
If you're using your Pickering with the brush then tracking force must be 1g higher, because the actual tracking force on the stylus will be 1g less because of the brush.

Recommended tracking force for XSV/3000SP is 2g !
You have to set tracking force at 3g with the brush to get desired 2g on the stylus @luisma31

@ihcho When DA-401 was released it wasn't a problem to buy additional headshell for this model. I have 3 original headshells for this tonearm to swap cartridges. The shell is super lightweight and this is why it's not a regular headshell. Now search for the headshell and buy it!