I am reluctant to say at this stage as I am sure if it is the guide at fault they will sort me a tighter fitting one out. Just a bit disappointed as I spent all day carefully disassembling, degreasing, polishing and burnishing and then after all that work its still twanging. The old spring guide is a better fit in the new titan spring, I could have just bought a spring and used the old guide and saved myself a bundle of cash .
I have a feeling that the end of the spring being so rough made it seem like it was a tighter fit. I polished out the grinding marks and took off the sharp edges and that was when it became apparent it was a loose fit.
The only other thing I can think of is that the Venom/Vmach kits had a thick white grease on the spring, which i am guessing is similar to the Maccari tars? Maybe that helps further dampen any twang.