Can you post a picture so we can see the blocks together? It's hard to know what to recommend.
Hopefully, the quilters will come along to help with their best suggestions for you. Until then,another option to think about for quilting.
How much blank space is there with two blocks together? You may want to consider the adjoining block space as one unit for quilting. In other words, simply continue the quilting across the blocks instead of stopping within each block.