No matters if you use L2OFF or L2J, you have full buffs for 2 hours+, so the balance, stopped called balance anymore..
Any "balance" mod, it's just a waste of time to import it.. Not saying that Isn't working or something, but you can work with the resists first. For example:
<skill id="1352" levels="1" name="Elemental Protection">
<set name="mpInitialConsume" val="14"/>
<set name="mpConsume" val="56"/>
<set name="target" val="TARGET_ONE"/>
<set name="reuseDelay" val="10000"/>
<set name="hitTime" val="4000"/>
<set name="skillType" val="BUFF"/>
<set name="isMagic" val="true"/>
<set name="operateType" val="OP_ACTIVE"/>
<set name="castRange" val="400"/>
<set name="effectRange" val="900"/>
<set name="aggroPoints" val="662"/>
<for>
<effect name="Buff" val="0" stackOrder="3" stackType="md_up_attr" time="14400">
<addMul order="0x40" stat="waterRes" val="15"/>
<addMul order="0x40" stat="fireRes" val="15"/>
<addMul order="0x40" stat="windRes" val="15"/>
<addMul order="0x40" stat="earthRes" val="15"/>
<addMul order="0x40" stat="darkRes" val="10"/>
</effect>
</for>
</skill>
By default it's val="20", try to pvp and check the damages. There are and other resists to work with. Do not disable the resists, just edit.. You can also with this way, to make the fear/silence etc to work sometimes. You will make this system for your server. Ofc, for a pvp server, you cannot have the fear/silence etc 30 sec.
Then, decrease the crt.dmg from archers if they are overpower. Create a invisible passive skill for archers.
Everything is in there.. You can make your own balance, no one can give you a balance for your server, only you, you can create it.. Based on your items etc..
Do not pay for something that you will never see a different.
Do not even enable the "balance config" from l2jfrozen pack. It's just a shit config.