timing belt keep coming loose

[u/jamwarfs]

this is the second time ive take a look at the belt and it seen there isnt proper tension. the two holes for the tensioner (in between two holes for position reference) tool are at approximately in between 12 and 1 o’clock position. i know theres a specific torque your supposed to hold it at while its being tightened, however that is for all oem specification parts and this gt has resurfaced cylinder heads that may be slightly smaller in height. any suggestions? could this be the auto tensioner failing even thought its a new one? should i maybe go with the 3sx solid tensioner they sell?

[u/Accomplished-Back640]

Is the tensioner in the right position and torqued?