I had another problem with a stuck/slow run off when sparging. I think my manifold is to low in the tun, i get great effeciancy mind it just takes me over an hour to sparge which although no major problem is still a pain in the arse.
Anyway i got about 28 ltrs+ at 1047 so im chuffed, had to chuck some wort though as only had a 25ltr FV

Wort was crystal clear also which was a bonus.
Not sure whats going on with my effeciency lately but im always getting over volume and over OG

What ive done to the mash tun is bend the long copper pipe backwards so it lifts the manifold off the bottom of the tun a fraction. It means ive now got 1ltr of dead space instead of 300ml lol but hopefully the sparge will quicker.
25 litre batch OG 1045 ABV 4.7 35 units of colour 43 EBU
HALCYON PALE MALT 3754 gms
AMBER MALT 250 gms
CRYSTAL MALT 400 gms
WHEAT MALT 200 gms
TORRIFIED WHEAT 400 gms
HOPS Boil time 90 minutes
CHALLANGER 42 gms
GOLDINGS 28 gms
Add 10 gms Goldings last 15 minutes.
Nottingham Yeast