I no experience with the Tavor, so take my info with a grain of salt
I have good experience with Geissele AR triggers and the are well known for using full power hammer springs in their match trigger .
Geissele, changes the trigger geometry to lighten the trigger ( see my previous post with pics ) , not low power springs
Yes, some manufacturers uses lighter hammer springs but , at least with the AR triggers , Geissele does not . All my Geissle will 100% ignite stubborn Wolf 7.62X39 primers
None of my non Geissle aftermarket triggers can come close ( RRA 2 NM , Timney , CMC ) with the Wolf 7.62x39
If find it odd, that Geissele for their Sabra triggers would go lighter on the hammer spring
You should call them . They have outstanding customer service