See, i'm actually -less- worried about this encouraging bombing honestly. Bombing is already itself enough of an encouragement "invulnerability time, takes the place of a life, easier to come by, deals a lot of damage". A piddly amount of power is not enough to turn people into bomb freaks. After all, no one ever consciously dies with bombs in stock if they can help it, because it's just a complete waste. It's always by accident.
What this "could" encourage slightly is the 'dying with bombs is a waste, use all your bombs' mentality, but everyone already agrees that's what you should be doing anyway.
With this said, the issue I had with it is one of 'outward face'. While a little bit of power wouldn't make much of a difference most of the time, it's still a "Man, so I screwed up and took a risk instead of bombing, and I get less power because of it on top of the life loss? This is stupid." It's about what the player reaction would be.
</psych> :V