Hi,
Based on the information given, there is no way that I know that one could correctly time entry points into the market to take advantage of the weekly or monthly market lows thus boosting one's equity holding rather, pick two dates in a month (or four days in you want to get more granular), space them apart and get your FA to initiate DCAs on those dates over an eighteen month period.
That should suffice for what you are trying to do. As a side note, consider Fundamental Investor (5%) and Capital World Bond Fund (5-10%) to the mix. This does not radically change your allocation as Fundamentals is blendish funds that throws out dividends and has a lot of upside to it...it has a nice tilt towards the value side of things while the Capital World Bond fund is a conservative way to tap into the global fixed income side ot things. This should bring you to about 35:65: almost mimicking Vanguard's Wellesely Fund except with a global component. The yield should still be in excess of 4% with some growth of payout built into the mix (provided some of the capital gains are reinvested back to your holdings).
Just some thoughts for you to ponder on.
Wayne.