Good ideas there ... but of course speed lap players will want more weight for
SL and zone players more weight for zone, so right now I'm gonna leave them
all equal, in a first step I'm going to improve the interpolation formula to better
reflect players' skills.

Yeah maybe I should modify the formula for Zone, originally I found the
parameters by giving 1000 points to the best player and a good score like 800
or 900 to a good or very good player etc. Now if a good Zone result scores 500
points only, then there is something wrong indeed!