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Have you centre spotted the secondary?
Which focusor are you using? With any luck it is not the one supplied by GSO. Those focusors are not great.
Check to see if all you collimation bolts front and rear are snug and not loose.
I doubt you will get collimation working with a Cheshire. Use the Tak scope only. It is most accurate.
The small screws on the primary are the locking nuts. Make sure those are snug but not over tightened.
In the Tak scope you will see a small black dot in the centre. Inside that you have to be able to see ever decreasing very thin white rings. Those rings are the inside baffles of the Tak scope. If those rings are slightly off centre you are not collimated. All the rings from those tiny ones to the very largest one must be concentric. The little tiny Tak rings are adjusted by a rear focusor collimation ring. If you don't have a rear focusor collimation ring you cannot do this adjustment.
Only a star test will get your scope fine tuned. There will be some very slight miscollimation after using the Tak scope but it should not be huge. If there is a huge difference between the two go hunting for something that is loose. Check the centre baffle ring to see that is just touching the primary and not completely loose. The 8 inch scope should hold collimation well.
My suspicion is that something might be loose or your bench collimation is not correct.
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