Judging by the look of the bike I would not expect sluggish steering - the head angle looks normal and the fork rake offset, even though it may not be perfect, doesn't look far out.
I had a similar problem with my ancient A.G. Duckett. This dates from th 1920's so it really does have a shallow head angle, which might have been seen as the cause of its heavy steering.
After struggling with it for some time (after restoration) I dismantled the head set again, and on close inspection I could see a witness mark where the crown race was fouling on the cup above - it was a replacement, and slightly too tall. Luckily I had another suitable crown race which was a bit smaller and this completely cured the problem.
Heavy Steering
I suspect there is a headset problem here.
Judging by the look of the bike I would not expect sluggish steering - the head angle looks normal and the fork rake offset, even though it may not be perfect, doesn't look far out.
I had a similar problem with my ancient A.G. Duckett. This dates from th 1920's so it really does have a shallow head angle, which might have been seen as the cause of its heavy steering.
After struggling with it for some time (after restoration) I dismantled the head set again, and on close inspection I could see a witness mark where the crown race was fouling on the cup above - it was a replacement, and slightly too tall. Luckily I had another suitable crown race which was a bit smaller and this completely cured the problem.
The Duckett has a Current Projects thread:
https://www.lfgss.com/conversations/369572/