There'sa few way to find bowling kakis;
1.
At your most frequent centre, look around when you having your
games, as timesgoby,you will see some regulars faces, if you find
them friendly enough(I hink most dose) approach them by asking if
you could join in their games, most would accept you.
Pros : A place most convenient and near to your home, less
travelling, become a Kampong Spider at the Centre. 
2.
Just as you did, soliciting Kakis on the web.
Due to different locations of the forumers, place, day and time is
always more difficult to compromise, unless all have their
transport, otherwise, rather tough.
How about this?
We booked lanes on every Sat. at PlanetBowl, (the only few
centralised centre left) from 4pm - 7pm.
I can't make it every week and need someone to co-lead the regular
sessions.
Goals & Objectives of the Sat. session?
Share bowling experience, form team to bowl in leagues, help each
other to improves bolwing skills(without official coaching)
Ultimate Goal?
Team PlanetBowl intend to gives up the slot for the next season's
Nat'l League. We "could" take over and have a chance to compete at
the highierif not highest level league in SG, if you guys game
enough.