1)
no, dont put weights on pets EVER cause a pet after lvl 15 at the beetles gets you shit exp, just walk to the farm and grab new ones instead of being lazy.

2)
http://forum.wl.igg.com/viewthread.php?tid=2611...

3)
Bursting exp doesnt "stop" persay, just drops dramatically after lvl 180 for ALL elements, most I've seen was my water in a 3 fire team they hit 62k and it was a 2x day he saw ONLY 300 exp . Most people above 180 that still burst are either burst pet trainers OR they are helping alts/friends lvl up.

4)4 fires isnt really the best way to burst, best burst is 3 fire 1 water, fires being low speed, water fastest, low lvl slow pets (horses, cows, beetles, etc), bursting on low lvl mobs.

stats)
str- seems fine to me for your lvl, just up con to about 120-150 then go str out
con- is decent for your lvl, but up it to 120-150
int- drop that shit :D your a melle not a mage lol
wis- put wis to 42 to unlock mess (not really a usefull skill, unless you can do a 4 turn debuff fire method) most just get mess for the sp
agi- drop back down to 4 cause you won't be outrunning many quest mobs later on without 750+ speed.