you are able to busrt with up to 30 speed. thats maximum you can have to still combo with cows/sheeps so you're fine. if your team mates freak out about you not having 0 speed then just tell them you have 0 speed they will never know cause you are still able to combo. or tell them they truth and explain. if they still freak out and dump you then the next team you find don't mention it.

aniways you should still try and get a pestle if possible if you are unable to get weights or save up and see if anyone is able to sell you one in game.

with a shadow pestle you'll need to be lvl 50.
and for the full defence set you need to be lvl 42.

as for any items under 40 there is;
defence armour lvl 38 -6 speed
pure iron cuffs lvl 30 -2 speed
any axe gives -3 speed you can get at any and all lvl. even buy a one in kelan or holy
copper wing boots lvl 30 -3 speed
great copper boots lvl 18 -3 speed

as for low weight you can get i think you can use at lvl 4-8ish are;
iron balls -40
short put -30
stone ball -20 (you can get one in india, calcuta from a quest if you can't find any)
people usually drop all these especially after 15round
so look in welling village city hall (where the bank and pet hotel and etc... is) go there and look around druing 15round. might find some on the ground along with food and other stuff.
aniways those are all i can think of for now hope these help.