Thanks, tendered to AMC-TENDER - feels very worrisome but I trust ken.
Are there any other precautions I should take. I have set up my bitfunder with a bitcoin address that I control and can sign from.
EDIT: And just to be absolutely sure, is this the address that is important?

yes that's the one. that address shows on this public list:
https://bitfunder.com/assetlist, prior to tendering your shares
EDIT:
I also PM'd Ken the transfer timestamp, my public bitcoin address and number of shares

Yes, everyone should have a public bitcoin address that they can sign.
Also keep a full screenshot showing your bitfunder username, and the transfer transaction of the transfer to AMC-TENDER.
This is your proof of the number of shares transferred.
We may need you to send a message from that public bitcoin address with the details of your transfer at a future time.
Please don't PM your transfer information.