I have some experience of Tribunals (not Employment) as a witness (albeit an expert one, not a "normal" witness).
Tribunals can do and say some very odd things, and see things in strange ways... but overall they are not bad and not stupid.
Pausing to ensure clarity is fine, but if a witness takes ages to answer it looks like they are trying to work out the best answer not the honest one. I hae next to no doubt that they will be looking at Fife's witnesses and thinking that Charlotte Myles was clearly the most open and honest, and that her account of trying to ensure a fair process in the face of biased colleagues engaged in a witch-hunt was highly credible, not least as all of her colleagues have clearly shown themselves to be biased and engaged in a witch-hunt.
The more your witness statement looks like you honest opinion, with no consideration of what others say and think, or the interests of your side of the dispute, the more you are likely to be seen to be credible and therefore listened to.