An expert server is obviously an ideal solution, but isn't really feasible. Server hosting for jump is already a challenge, with generally low server usage vs something like surf where ping is much less of a challenge, so server populations are much higher.
I don't think there is a clear solution to this. I personally think that Tempus needs to do more to help support and teach new players, for instance better feedback when they join and immediately do !regen. Hopefully doing a better job at teaching new players will develop a better culture around taking on challenging maps or even considering that others are running maps.
The reality is that while Tempus is certainly geared towards competitive jumping, we want to help as many players as possible learn and enjoy jumping. So we're trying to avoid any steps that immediately alienate any players.
Feedback on how map tiers is influencing voting would be appreciated.