25-18-15 points system: too much for 2nd place?

There's been a lot of talk about Abu Dhabi and double points but relatively little discussion of the underlying points system that got us to this point.

Over the years a number of systems have been used; for brevity I'll just list the points for 1st, 2nd, 3rd. The most significant factor is the value of a 2nd place finish relative to 1st so I'll call that out as well, along with where we would be in this year's championship and what Hamilton would need to do to win in AD (assuming NR wins the race and ignoring double points). In chronological order:

1950-1960: 8-6-4 (2nd worth 75% of 1st); LH 113-108 NR (Hamilton would need 3rd - 1 point for fastest lap)

1961-1990: 9-6-4 (2nd worth 67% of 1st); LH 116-108 NR (Hamilton would need 6th)

1991-2002: 10-6-4 (2nd worth 60% of 1st); LH 126-113 NR (Hamilton would be champion)

2003-2009: 10-8-6 (2nd worth 80% of 1st); LH 136-135 NR (Hamilton would need to win)

2010-2014: 25-18-15 (2nd worth 72% of 1st); LH 334-317 NR (Hamilton would need 6th - 2nd with double points)

[Obviously the 1950-1960 comparison is even less meaningful than the others, since different drivers might have won fastest laps if there were points for it].

So over the years 2nd place has fluctuated between 60% and 80% of the value of 1st. I think that 80% was widely accepted to be too high (For instance, Raikkonen came close to beating Schumacher in 2003 with Schumacher having won 6 races to Raikkonen's 1); the devaluation was a side effect of having more point-awarding positions (increased from top 6 to top 8 in 2003). The new system in 2010 increased the point-awarding positions again (from top 8 to top 10), and somewhat lowered the value of 2nd, but it's still higher than it has been for most of the sport's history.

Is 18 points for second place too much?

Similar ratios to the 1961-1990 system would give a 25-17-11 system (LH 323 - 303 NR, Hamilton would need about 5th-6th).

Similar ratios to the 1991-2002 system would give a 25-15-10 system (LH 315 - 283 NR, Hamilton would be champion).

An "in between" ratio would be 25-16-10 (LH 318 - 293 NR, Hamilton would be champion).

Any thoughts?