1. SKyrim has it's own Vsync which can be turned off if one wants to in the skyrimprefs.ini, IpresentInterval=0.
A better way of disabling vanilla adaptation and bloom without causing mod incompatibility is to add proper code for control of those effects in the enbeffect.fx file.
Just check my enbeffect.fx for such a code here -
viewtopic.php?f=6&t=1503If you have problems implementing the code just let me know and I'll guide you through the process of doing so.
The code will allow you too adjust both the vanilla adaptation and vanilla bloom or just simply turn it on and off.