As in many of their other losses Truro failed to take their chances when they came at Huish Park.
They were eventually undone when Will Merry scored in second-half stoppage time as they conceded yet another late goal.
“It’s that bit of quality,” added Askey, who led the Tinners to a historic National League South title last season.
“You’ve seen the lad go through today and finish for them, and that’s happened quite a few times from the opposition.
“You come away thinking ‘oh, we haven’t had quite so many chances today’, but we get in good positions and we don’t make enough of those positions.
“It’s either a bad touch, a bad pass, a bad strike at goal, and that’s the difference.
“It’s not through lack of ability, because I see it in training, but you’ve got to put it into practise in a match and we aren’t doing that.”