I've got the same scope (£80 off fleabay) and with the stock 10mm I've seen one, smudgy band on Jupiter. Using a BST Starguider 8mm I can get two bands, but my mind has transposed this to looking at the top of a flat headed screw.
I think from a guide on eyepieces on this site, the recommended high mag eyepiece for the 130/900 is 5mm.
Does the OP have the motor for this scope? This may ease long term viewing, providing it doesn't induce the wobbles that getting anywhere near the near scope does on the EQ2 mount. I've not been able to verify this yet, but hopefully it does!