hi Andy - the amount that you stake depends on the size of the data 'chunks' in your wallet. for example, suppose you have a 2 year old wallet that's been staking that long ... under the old system, every transaction would split every 'chunk' that stakes, so over time, you have hundreds or thousands of small inputs, like 100 -300 ZEIT each, which would only remit a very small reward under ULI

  to fix it, enable coin control: menu bar>settings>options>display tab>Display coin control features

then go to the [send] tab, and you'll see some new stuf

hit the 'inputs' button, and using this you can combine the small inputs into larger ones by creating a transaction to yourself. you can send/recieve from the same addy, or create a new one to recieve the transaction  

 all my chunks are ~2.6m, and are returning about .05 ZEIT  per stake. i'm getting lots of orphans too though  

also, you'll only have to do this once under ULI, as the chunks will no longer be split