I routinely use Wislon Nat Gut with MSVCF 1.18. I fast pull the gut and SLOW pull the MSV and allow it to stretch for at least 20 seconds before clamping.
On Tues for some reason I simply forgot to change the mch to slow pull for the MSV. OMG, what a difference it made. String bed was boardy and stiff as opposed to my usual just start playing it with no breakin period.
I'm amazed at what a difference that one change made in the performance of this set up... I won't be forgetting this again..
Head YouTek Prestige MP (18x20) - Wilson Nat Gut 17/MSV Co-Focus 1.18
(58/56) - Gamma X-Els