Issue with Dell N4032F

I'm trying to configure ISCSI features as indicated in 

https://infohub.delltechnologies.com/static/media/ea3589fd-089e-41b4-b820-9553659e2b84.pdf

There seems to be remanance of a previously configured iscsi config (I know the screenshot shows disabled, but i've enabled and rebooted as well)

dell-iscsi#show iscsi

iSCSI disabled
iSCSI CoS disabled
iSCSI dscp is 53
Session aging time: 10 min
Maximum number of sessions is 252
------------------------------------------------
iSCSI Targets and TCP Ports:
------------------------------------------------
TCP Port    Target IP Address    Name
---------------------------------------------------
iSCSI Static Rule Table
---------------------------------------------------
Index TCP Port    IP Address       IP Address Mask
 1    9876              -                -
 2    25555             -                -

dell-iscsi#

When attemtping to configure from that state ^

Index TCP Port    IP Address       IP Address Mask
 1    9876              -                -
 2    25555             -                -

dell-iscsi#configure t

dell-iscsi(config)#iscsi ?

cos                      Configure the class of service parameters that will
                         be applied to iSCSI flows.
enable                   Configure globally iSCSI awareness.

dell-iscsi(config)#iscsi enable

Enabling iSCSI Optimization will enable Flow Control which may cause all the interfaces to temporarily go down.

Are you sure you want to continue? (y/n) y

dell-iscsi(config)#iscsi >?

dell-iscsi(config)#iscsi ?

cos                      Configure the class of service parameters that will
                         be applied to iSCSI flows.
enable                   Configure globally iSCSI awareness.

dell-iscsi(config)#iscsi target port 3260
                         ^
% Invalid input detected at '^' marker.

dell-iscsi(config)#

Note, the 'iscsi target port 3260 is (trying to) set iscsi to detect the default iscsi port - no voodoo 

Please help - not a network guy!
Fundamentally - I'm trying to get better performance. This is only 1 server connected to 1 nas. Directly - I get 10Gb speeds; thru the switch I get *maybe& 2gig. Same general setup (MTUs, etc..)

Same workload, same server, no other traffic on the switch