Okay so I just started working this piece (which I'm in love with by the way

)
The first big chord after the octave quadruplets, my hand is slightly too small to get the top notes in the L-H with my thumb. I was debating whether to play the bottom note first, then shift to the rest of the chord or play the bottom two notes then the rest of the chord, or what. I tried stretching exercises, which I had been doing for a week or so, but then I pulled a nerve, so that didn't work. My hand is better now though, but I still can't get that chord down properly.
Any suggestions?