You will get bashed no matter the premine.
See as an example monerov and monero, these guys are bashed but are the first ones to come up with a privacy issue with Monero.

Premine size is all about planning for the future, what is your project is solving.
A great example for this is Dash, which at least got the funds to establish a great network, develop, and market a good coin.

PS, thank you for the service