Try :
[smartzoom]
auto_follow_time=10
enabled=1
maxzoom=200
minzoom=100
minangle=15
maxangle=70
overview=0
overview_zoomlevel=5000
overview_distance=30000
angleoffset=8
minzoom2d=50 ; (200)
maxzoom2d=1500
zoom2dpercent=135
zoom_after_find=1
use2d=1
zoom_after_find=1