Heirophant staff is honestly, really weak and just used for intimidation. It does jackall damage with its spells, Xenos can ignore it, and just heal from the resin faster. Tspiders can just do the same in webs. The only good thing about (not counting the pretty lights it makes) the heirophant staff is, is for an emergency teleport out, but in saying that, that requires the user to stand still uninterupted for 5 seconds.
Meathook is STRONG, yes I will admit. HOWEVER this requires you to actually aim at a target, and connect. if it misses, it has a HEAVY cooldown. Most of the stuff obtained from lavaland honestly isn't too bad, considering the risks.
Dragon Transformation, again strong however very fragile at the same time, glass cannon and unrevivable should you die.
Lavastaff and Staff of Storms, both I will admit are the VERY strong counters to biohazards such as Tspiders and xenos, but at the same time prove a risk to the crew so... I guess its a trade-off?
In any sense, I don't see an issue with miners being able to counter biohazards considering they already go against giant man-eating skull-face-things and angry birds and dragons. They should be threatening to fauna such as Tspiders and Xenos. Play around it and play stratigically. They aren't immortal, just tougher than your regular folk.