REGA RB 303 to RB 808

On my REGA RP6, already upgrade with: sub-plater, mat and counterweight,   would it be a good improvement in musicality if I change my stock RB303 ?
What kind of a counterweight !  I'm not thrilled with mine on my RP6 .
Groovtracer counterweight and sub platter, and Funkfirm TT mat.  Happy with the result. 

Thanks , I have the sub and Funk . on to Groovtracer .