Regarding the power, the right time to develop the number of participants to achieve adequate power is at the beginning of the study — it is to late to discuss while the trial is closing.

NP is right in that more participants drives higher power but more participants cost more and take longer - (remember this is a phase 2).

Let get the results out and if it works really well the number of participants should be sufficient to demonstrate efficacy.
IMO

Also, sorry about directing the fox new comment in my reply to you - it was actually BigO that made that comment