One thing I will say, having recently levelled a character to 30 while doing minimal dungeoneering and writwork, I found being at RPR 40 resulted in him hitting 30 much more quickly than I anticipated. I didn't completely ignore writs; I did more than a handful early on to help get my character money, but I made a deliberate choice at around level 15 or so to rely mainly on the XP tics to progress while I RPed about town. At that point, I would pretty much only take writs the character was overleveled for to make sure my Adventure XP pool wasn't empty.
It did NOT take very long for that 160 per tic to get me all the way to 30. Not necessarily a problem, but it definitely caught me off guard.