I don't think you should have any issue with the cartridge weight with default counterweight. I can make a few comparisons to when I had a properly set up Ortofon 2M Bronze on a P3. The XX-2 weighs 8 grams and Bronze weighs 7.2 g. There was still plenty of VTF adjustment headroom at 7.2 g to accommodate 8 g.
The XX-2 cartridge height from stylus tip to cart mounting surface is 18.7 mm and the Bronze is 18 mm. This one is a little trickier to reflect on because my tone arm was perfectly parallel with the Bronze so I'm not sure if the extra 0.7 mm will make a significant difference.
You could pick this up for $15 if needed.
https://www.needledoctor.com/Rega-2mm-Spacer-for-RB250-300-600?_vsrefdom=adwords&msclkid=1b85cca...
The XX-2 cartridge height from stylus tip to cart mounting surface is 18.7 mm and the Bronze is 18 mm. This one is a little trickier to reflect on because my tone arm was perfectly parallel with the Bronze so I'm not sure if the extra 0.7 mm will make a significant difference.
You could pick this up for $15 if needed.
https://www.needledoctor.com/Rega-2mm-Spacer-for-RB250-300-600?_vsrefdom=adwords&msclkid=1b85cca...