Tier 2 Extension queries

Hi

My current Tier 2 general visa will expire in Feb 2016 and had some queries regarding the extension.

1) Currently my salary is £31,827 but experienced rate salary in my code (2126) is £32,100. Should I ask my employer to increase my salary now and inform UKVI about the same through SMS, or should I wait until extension and ask my employer to put salary of £32,100 on CoS then? If employer agrees to increase it now by £273 to £32,100, does he have to inform about it at all, given that this is such a small amount?

2) Should I ask my employer to ask for unrestricted CoS allocation now? I know it is a bit early but I read that this can take upto 18 weeks so I am a bit concerned to leave it to later date.

3) I will be elligible for ILR in 2018. We typically get yearly bonus during June and or December. After my extension, if I ask my employer to increase my salary in lieu of bonus, would it be acceptable, given the fact that all other employees will get bonus but I won't, but I will have increased salary?

Would appreciate any helpful replies.

Thanks!