Never played a Shuttle, but my Streamliner 900 pairs really well with Ampeg cabs. I currently run two SVT210HE cabs with Eminence Legends with my 900. I have also paired it with 410HLFs and 8x10s with good results.
Different head, I know, but hope that helps a bit.
Precision + Streamliner + Bassic 15 (GBD Club #103) = sonic bliss