Just having a dig in GDS for advance previews, and it appears TAP will be increasing to 12 weekly from May 1st 2014, then 14 weekly from July 1st 2014:
TP326 LIS 0745 MAN 1045 MTWTFSS A320-100/200
TP329 MAN 1120 LIS 1400 MTWTFSS A320-100/200
A321 ops on Mon and Sun
1/5/14-31/5/14
TP322 LIS 1340 MAN 1630 MT-TF-S A319
TP323 MAN 1715 LIS 1955 MT-TF-S A319
1/6/14- Onwards Wed/Sat added to TP322/323 schedule with F100.
Extra flights are not available for sale at this time as S14 schedule mirrors W13/14 schedule.