Keep snapping Presta valve heads. Anyone converted to Schrader valve type?

[DarkShadow]

I've snapped a few too many heads this year and I'm getting really frustrated will the valves. Despite only opening it a little to reduce give, they're too flimsy!

I have a hybrid bike that has 700c x 35 tyres.

Has anyone experienced similar or drilled a hole to fit schrader valves?

 

[DarkShadow]

How are you managing to snap them?!

I pulled off the pump and off came the valve with it!

 

[DarkShadow]

Wonder if it's your pump? I've never had this happen

I am starting to believe this could be an issue. It's a decathlon mini pump and it sucks.