1) No. Crystal knife effect is that it has a chance to auto string a bow giving the xp for it when you cut it. As protos do not become an unstrung bow and cannot be strung it cannot trigger.
2) As far as I am aware Seren Stones beats all, but I'm not certain. LRC could be faster, but alot less afk.
3) I'd guess no. Afaik barb fishing always was better than c2s - it was just a lot more click heavy and hard to get perfect xp rates with all the dropping and what have you. Take that away with the consuming suit and I see no reason it would not be the best.
Seren stones can be up to 160k/h as per tested myself. However that is without VOS or BXP, but with Crystal Pickaxe, full golem outfit and Lava Titan. And that is what my average was. I sometimes got over 180k exp in an hour, but sometimes I only got 130k-140k in an hour. It heavily depends on how empty the place is.
C2 was always better than BA fishing before the Shark suit comes. I imagine now BA is better or equal to C2 fishing, partly due to it less attention needing.
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