Formula URL - Edit then Add

Hello Everyone,  

I'm trying to create a single button that will allow our users to add an effective end date to a record on form ID 11 and then when that is saved redirect to the add record api using form ID 10 populated with data from the previous record.  Since I haven't been able to get it to work in a single button I created 2 buttons.  Indivually both buttons work but combining them isn't.  Any ideas?

Step 1 code: 

URLRoot() & "db/" & Dbid() & "?a=er&rid=" & [Record ID#] &"&dfid=11" & "&rdr="

Step 2 code:

URLRoot() & "db/" & Dbid() & "?act=API_GenAddRecordForm&dfid=10" & "&_fid_6=" & [Paragraph]  & "&_fid_7=" & [Publication]  & "&_fid_8=" & [Description]  & "&_fid_11=" & URLEncode([Staff Contact])  & "&_fid_17=" & [Effective End Date]    & "&_fid_19=" & [Record ID#]

When I combine the code I'm using this

URLRoot() & "db\n/" & Dbid() & "?a=er&rid=" & [Record ID#] 
  &"&dfid=11"
  & "&rdr="
&URLEncode(URLRoot() & "db/" & Dbid() & "?act=API_GenAddRecordForm&dfid=10" 
  & "&_fid_6=" & [Paragraph]
  & "&_fid_7=" & [Publication]
  & "&_fid_8=" & [Description]
  & "&_fid_11=" & URLEncode([Staff Contact])
  & "&_fid_17=" & [Effective End Date]  
  & "&_fid_19=" & [Record ID#])

I feel like I need a pause before the   & "&rdr=" in the third line as I get an error saying something went wrong.

For now I will keep it 2 separate buttons but it would be great to combine them and using the save function on the edit record to trigger the second step.