I don’t find tech rolls that unbalancing!
The problem is to teach a newbie that it’s a gamble, and often a bad one, if he got lucky the first times!
A way that have worked for me, is in the situation where the first roll don’t succeed , and he progress for the second, I tell him, that for now on, I counter every tech roll he make, with tech rolls my self, and meanwhile just tell me who have an advantage on the board!
This can be an eye opener to the fact that tech rolls is either a gamble or a luxery , and that your side in the game should be in a situation where a gamble or a luxery is apropirate before using them!
Jondifool