[Solo Bosses Drop Rate]

Can someone tell me the conditions that effect drop rate from Solo bosses. 

Do these effect it:

My level vs boss level? 

My Party level range? (if it is more than 9 lvls apart does it effect it?)

Sayha, do this also effect drop rate of solo boss.

Thank you

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I'm an old school player, starting from C2, and I always remember how awesome Striders looked to 14 year old me. 

I remember finally getting one around C4, and it was before pets or summons were viable in gameplay, I spent hours trying to level it and it was useless. 

I would definitely relive the nostalgia with a Strider now, and enjoy the fact that they are viable.