I upgraded my turntable to a brand new P10 last year. So I thought. It was very disappointing. My old modified Heybrook TT2 was better in many regards. I sold the P10 in the same month to replace it with a good old Linn LP12 fully upgraded with Kore, Cirkus and Lingo 3. What a difference!
A well equipped LP12 does it for me and there are excellent ones on the second hand market. The other option for me would be a new Pure Fidelity. I just installed their Stratos cartridge and it is absolutely fantastic for the price. Better than a Hana ML and comparable to the Umami blue (a bit less detail but more punch and soundstage).
bottom line, moving from a P6 to a P8 is not a real upgrade IMHO. After finding the right turntable then pick the matching phono stage if not satisfied with current one. The phono stage will not correct the source if it not at your satisfaction level. Good luck and keep us posted.