It is my understanding that most brokers offer Rithmic feed without historical tick data. Optimus Futures is an exception: ( Second post from the bottom) https://www.sierrachart.com/SupportBoard.php?ThreadID=6881 https://www.sierrachart.com/SupportBoard.php?ThreadID=8026
As you said the "weird snapshots" is off by around 70 pips at times, so is that weird snapshot is really traded in market or it never traded in the market? have your cross check with some reliable historical tick data source?