Witte de With's journal has pretty good coverage of Rotterdam ships with the fleet from September 1652 up to November 1653. If Ruth Jacobsz Buys' ship in September to November 1652 was a new ship, then my previous estimate of Sint Pieter, from Ron van Maanen's list might be true. First, we start with September 1652:
Admiralty of Rotterdam
Captain                   crew guns Ship (not listed in journal)
Vice-Admiral de With      150  36   Prinses Louise
the ship of Lt-Adm. Tromp           Brederode
Capt. van Nes             123  30   Gorinchem
Rotterdam Directors
Captain                      crew guns Ship (not listed in journal)
Capt. Corstiaen Corstiaensz  130  34   Prins
Capt. Ruth Jacobsz Buys                Hollandia
 
We next see lists for May 1653:
Admiralty of Rotterdam
Captain                      crew guns Ship (not listed in journal)
Commandeur Haexwant           98  22   Utrecht
Capt. Vijgh                   98  24   Overijssel
Lt-Cdr. Pieter Verhaven      120  32     
Capt. Willem Arentsz Warmont 116  30   Gorinchem
Capt. Kerckhoff              116  32   Dolphijn
Capt. Aert Jansz van Nes               Gelderland
The ship of Lt-Adm Tromp     268  56   Brederode
Rotterdam Directors' Ships
Captain                             crew guns Ship (not listed in journal)
Capt. Ruth Jacobsz Buys              95  26   Hollandia
Corstiaen Eldertsz                   95  24   Roskam
Capt. Sijmon Cornelisz van der Meer           Sint Pieter
Capt. Jacob Cleijdijck              168  38   Prins
Rotterdam Chamber of the VOC
Captain                         crew guns Ship (not listed in journal)
Jan Arensz van der Werff        124  32   Wapen van Nassau
This seems to be from July 1653:
Admiralty of Rotterdam
Captain                      crew  guns  Ship (not listed in journal)
Lt-Admiral Tromp             290   55    Brederode
Capt. Haexwant               100   22    Utrecht
Capt. Vijgh                  105   24    Overijssel
Lt-Cdr Pieter Verhaven       106   30     
Capt. Aert Jansz van Nes      99   24    Gelderland
Capt. Abel Roelantsz Verboom 155   36    Prinses Louise
Rotterdam Directors' Ships
Captain                             crew  guns   Ship (not listed in journal)
Capt. Jacob Cleijdijck              147   38     Prins
Capt. Ruth Jacobsz Buys             100   26     Hollandia
Capt. Sijmon Cornelisz van der Meer              Sint Pieter
Rotterdam Chamber of the VOC
Captain                         crew  guns   Ship (not listed in journal)
Jan Arensz van der Werff        128   36     Wapen van Nassau
These are the ships with the fleet from September to November 1653:
Admiralty of Rotterdam
Captain                  crew guns Ship
Capt. Egbert Meeuwssen   275  54   Brederode
Capt. Abel Roelantsz     131  36   Prinses Louise
Capt. Aert van Nes       114  24   Gelderland
Rotterdam Directors' ships
Captain                  crew guns Ship
Capt. Cleijdijck         146  38   Prins
Capt. Ruth Jacobsz Buys  100  26   Hollandia (there is a word preceding this)
Rotterdam Chamber of the VOC
Captain                  crew guns Ship
Capt. van der Werff                Wapen van Nassouw