yes the main concern is someone paying an invoice successfully and then someone (maybe same person or other) paying that invoice again from another wallet. 

another concern is if a payment looks stuck and making the payment again on another wallet. 

if a payment fails and you make the payment again then you are fine.

there's a wormhole attack here too that users dont need to worry about too much it's mostly a router level attack 

no i don't believe so as the payment never found a route during the probing process.  

if i understand correctly this is related to invoice reuse after a prior successful payment 

2big2fail

Is this an example where I'm at risk?

Let's say I try to withdraw from SN, and the max fee I entered is tow low, so eventually I get a message saying failed "timed out finding route", and to "try increasing max fee".

If I increase the max fee and try again with the same invoice, is my second attempt vulnerable to this preimage stealer?