ILR Eligibility Date

[pca123]

Hi
I just want to check my eligibility time for ILR. My details are as follows
Received my Tier1 visa from India on 15/01/2009
First entered to UK on 30/05/2009 for a job interview. However I left UK after two days to Germany as my family was in Germany. I kept coming to UK for interviews from Germany and used to live in UK for 2 weeks’ time till I got a job in April 2010. When I got my job offer, company wanted me to change my visa category from Tier1 to Tier 2. So I applied for Tier 2 visa from inside UK in Feb 2010 and granted my visa on 23 March 2010. From 12th Aapril 2010 onwards I am a regular employee till this time.
After my first entry on 30/05/2009, second entry was on 15th September 2009. Stayed in UK for a week and went back to Germany. However from 17th Feb2010 onwards I am living in UK continuously except few vacations to India & Germany.
My query is whether I am eligible to Apply for my ILR on September 15, 2014 as my leave from UK from 15th September 2009 onwards till date is less than 180 days. If I am eligible, for justification of my absence from UK till I was employed (in Tier1 visa) a personal letter will be sufficient? I know my case is a peculiar case. All expertise knowledge from this forum members are highly welcomed.
Looking forward for your reply.