Uneven volume and tone and attack between fingers

What is the best way to get an even attack and tone from playing rapid consecutive notes.

I only play with my fingers and for most things my right hand technique uses the side of my fingertips of my index and middle fingers similar to Stanley Clarke rather than the tips which I see most bass players doing. This means effectively I have my fingers brushing the strings rather than plucking in towards the bass. I find this gives me a warmer tone and for faster passages there is an even tone between notes. However some tracks I play require a more pronounced attack such as Sweet Tooth by Victor Bailey and What is hip? But to get the right tone for that I have to play with the tips of my fingers having my palm facing the bass which means my fingers are basically 90 degrees to the strings and because my index and middle fingers are different lengths I find that I have problems with getting an even note tone between alternating fingers. Any advice to offer for getting this technique better.
Cheers