Manus a confidence player. Success helps to breed confidence and we seen that so many times with Manu in that, when were kicking ass, its usually Manu on the news scoring in the corner and kissing his finger and pointing up to God.
He should look at hitting small targets. S.MA.R.T approach, it works! If Manu sets and really endeavours to achieve his small game by game goals for training and games (e.g. 100 high bomb catches at training, quicker times in agility and acceleration) I think this will help to iron out those errors if hes not already doing that now.
Plenty of encouragement and praise not for scoring tries, but for doing things hes not normally good at.
If he drops confidence through a setback, dont allow him to become consumed by it like he did in that game. Thats an example of quicksand. Those situations need a past/current/future mindset, a pre-phase mental imagery if yous get me, but thats another long story. Manu can catch, we seen that more than drops. Its just a mental problem.
Basically we need him to start the season. We need to play well and play him a lot.