Tbh there rubbish m8 i've just removed a set from a friends car and fitted std head bolts as the gasket let go after 4.5k due to them coming loose and incorrect fitment
Also i have them in mine and will be taking them out when i do my stem seals
i Torqued mine up to 110nm first then 130nm once engine had run and fully cooled
so its back to std bolts for me 25,50 nm and half a turn job done
so retorque to a higher figure and hope that your gasket seals
Paul