I do NOT use an electric / battery drill (motor*) or other power driver when I have to use an E-Z Out or similar. I prefer to use a T-handle tap wrench. (I prefer to use a tap wrench with taps as well!)
As with a previous reply, I have had success using an oversized Torx bit to remove Allen screws.
However, if it’s new and you can substantiate that, I would recommend that it be sent to Ruger. They will fix it properly, or replace it.
Sometimes I have had to suppress my irascible manly instincts that tell me that I can fix anything - and let the manufacturer do it. I know it’s tough, but I can attest that it is possible! Unfortunately, during the return period, you will have to do without the beloved implement, and I don’t like to have to do that either. But it’s for the best!
Hex (Allen) fasteners can be frustrating. I wish manufacturers would switch to Torx fasteners. It seems like the smaller the fastener, the more likely it is that the head will strip.
* I use the term “drill motor“ to differentiate between a drill, which is the item that causes a hole to be made, and a drill motor, which is a device that turns a drill.