Help getting TACX cycling to display correctly in surround

[Dr Teeth]

Hardly mass market stuff, but I need to find a way to fix distortion when using TACX (cycling software TTS4) with three screen NVIDIA GTX 980 surround setup which performs fine in every way except everything is too wide for the depth (so figures look short and fat). Benn looking for a tutorial to make fix that I can add to Widescreen Fixer and wouild be grateful for pointers if I've just not found them on the forum. Thanks in anticipation.