Try to stay on the lower end of areas within your list of places within range. Instead of practicing in an area that's Expert to Grand Master, perhaps a place that's Expert to Mentor. Familiarity will depend greatly on a number of factors.
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Allow me to oversimplify things greatly:
*Let's say it takes 2000 xp to get to level 2, 3000 xp to get to level 3, et cetera.
*Let's also say that NPC X, and NPC Y are both within range of an amateur character. NPC X offers 25 xp, and NPC Y offers 100 xp.
*Finally, let's say that an area gives you a certain number of xp points before a familiar tick.
Considering these things, if you begin with NPC Y in Area A, you will notice very quick advancement. Going later to NPC X in Area B will take more time to gain the same number of xp points, PLUS you need more xp to advance. Your familiarity could suffer in this manner.