Thanks Bush, g8, Nord for taking time to chime in.
I had been quite happy with the Decca arm/ cart combo on L75 in the past, since before Christmas I only had one deck up and running, the PTP and L75 where waiting for set-up after changing out cartridges.
On the Decca arm I installed Decca blue that J.W. did up for me, this one had new conical stylus installed, tieback, potted, up to spec.
On PTP Grace arm installed Grace f9 with ruby cant.and FG stylus done up by Joseph

, when first received I ran it for couple hours, then went back to Stanton 881which i liked very much, then the L70 arrived, did some experimenting with Decca Blue on L70 arm where it worked quite well none of the issues I read about in the Decca thread ( yes I got through the whole dang thing

) eventually I settled on the Pickering
XV15 625E for L 70.
Finally all 3 decks up and running...my oh my the grace Ruby has really started to show its stuff after about 40 hrs.
Did some serious comparisons over couple nights, found detail galore ,no mushiness in bass just clarity, with G ruby.
The L70 and L75 just couldn't keep up, now must state L70 and PTP going through same phone stage and L75 into phono on deck, got to thinking better phonostage would help L75/Decca combo.
Hooked L75 up to a tube phono just back from my tech guy and what a difference, lots of detail, no fuzzy bottom end, full bodied sound...
The L75 with Decca arm is a keeper, I new there was good potential there but it was gone...IT'S BACK