I play javazon with eth titan+Phoenix,i love the mana from pheonix but i want to try spirit build.

I can only put the new light jewel on griffon,atm iam using griffon with a 15ias 30lr jewel in for the 5x ias bp.
Is it worth to loose the ias bp for the new jewel?
Iam also using razortail for 100% pierce,without iam about 75% it ok to remove for arach or gheed wager?
How many maek is ok for confortable mana reg?
Iam planning to use java gloves with maybe 3 maek, and mana leech ring+1maek
So something like 6%mana leech and 4 maek in total

With the javazon you will probably have to sacrifice someting. Either one of attack speed, pierce or fcr to get decent QoL on the mana. That's up to you to figure out and try with the items you have available. I lvl'd a zon to 99 with a missing ias breakpoint and an arach belt for 99 fcr because I had a great caster amulet so I built around that.

Mana steal works very well with an up'd titans and some max dmg/ar charms. That's something not many people think of trying.