The ability to throw a dagger or a grenade at a moment’s notice is the more interesting aspect of throwing, though as implemented it is unrealistic. Perhaps compensate that by making most of throwing inferior to its competitors. Think of it this way: just use a bow as a low tech dedicated range option if its needed. If something gets close throw an ax without dropping the bow and without the need to aim as a pseudo melee attack. It won’t be as op if something else readily accessible is just better, and can still be useful if it complements what else the character does best. The real number crunching can start with grenades, which might be better documented and needed due to their single use nature. If someone can get hydraulic muscles, railgun, the other minor support items, and the strength to carry an engine in their pocket then go to fantasy levels of over powered. Maybe then turn throwing into a heavy resource spender for hulk levels of destruction.