@Toby14
my .02 Please return the VCT 1.18 and exchange it for 1.30 VCT, or simply throw it in the trash. Do not string it in your frame. VCT is only playable in the 1.30mm version if you are a 3.5+ rated guy and hit with any topspin whatsoever. The 1.25mm loses tension so quickly it is like a completely different string compared to the 1.30mm VCT. I can imagine how quickly the 1.18mm version would lose tension.
I have been using VCT 1.30mm since 2014 and have bought/strung over 20 reels of VCT since then. I had a friend purchase it against my advice then asked me to swap his 1.25mm reel for a reel of my 1.30mm when he complained of the tension loss and string movement. I told him to throw is reel of VCT 1.25mm in the garbage as I had absolutely no use for it whatsoever. People don't seem to get it, so they buy the 1.25mm VCT version thinking it plays like other 1.25mm strings.
VCT 1.30 works well for three now 5.0 players with a history of TE. (SC, AH, and PC have all had issues with their elbows and don't like stiff strings/frames) Saw AH last night after hitting with a bunch of 4.5 & 5.0 guys. AH uses VCT 1.30mm in Pure Strike 2nd Gen 16x19 frames, after using Head Velocity 1.30mm in his Babolat Pure Controls for the past year. He has no issue with VCT 1.30mm and he is coming from a multifilament.