I am sure you are rigging like this ????
View attachment 628389
In looking at the Ingland block picture I see here:
https://www.ebay.com/i/113734223555...xauu0T7LEe3GsNQSXzvc-d9zzYuOkyVBoCs68QAvD_BwE
I see what might be a problem. There has to be room enough for the slider to run around the sheave in the groove w/o binding on anything. If the slider hits a binding point before the trigger it will jam. To me it looks like that block/spacer that is under the trip lever does not leave enough room between it and the sheave for the slider to pass by. I would look at that closely and maybe find some smaller sliders, or make a small dummy slider thing you can put on your cable so it hits the snatch block first and can pass thru that space to trip the lever, or just grind back that spacer - I don't know why it is so long but there must be a reason I don't see so go a little at a time.
gg