You can use any value beteween 0 and 1, including .03451.  

I'm not saying you need to use any value, even .5;  I just mentioned, for example, that .5 is an even split between the two images.  A Blending value of.5 means that each image would be %50% present after the Blend.

Did you try to adjust the Blending value?  I'm not sure where you got .0345, but it would mean that one map would be very dominant, while the other would only have a very small part of it mixed into the blend.  Something like one map would be 97% present, while the other onl;y 3% present, after the Blend.

If this still wo'nt work, then there must be something else you're after, rather than just mixing the two images; so what kind of adjutments did you want to make, seperately?