hmm, could it be a spillover from Aljunied? (I dun think ur model accounts for that component) I thought one thing that was interesting abt the general WP strategy was that it contested seats which surrounded Aljunied GRC. While most of the resources are poured into the said GRC, there is bound to be a spillover effect with residents from the surrounding areas going to Aljunied rallies, as well as the attention of voters recognizing the importance of the Aljunied race, which will be further heightened by their geographical proximity to Aljunied. (As for East Coast, you have to factor in the introduction of a new PAP candidate, and the superior stature of the WP candidates there as compared to the other WP teams, it was almost akin to a B plus team) Conversely, the rallies were held at the different GRCs every night, but always at a location that is close to a component of Aljunied GRC, so indirectly, it is an incessant nine day campaign that took place within and around the priced target.
Take this and compare it with the NSP model, which waged it's bets all over the roulette table, thereby not able to take hold of the advantages of geographical proximity.
Next for the WP, I hope they will further emanate the Aljunied centric strategy and expand the center into East Coast, Nee Soon and maybe even Moulmein Kallang next election, and field B teams in the peripheral areas around these GRCs. But that will mean stepping upon other's toes, but I think u are now THE OPPOSITION - why do u need to give two hoots about the other minnows.