I have been looking into absences from the UK and how it affects application for ILR. Historically, the absence periods allowed when applying for ILR were similar to those when applying for naturalisation (averaging 90 days/year)
But the UKBA then dropped any sepcific requirement and left it to the discretion of their officials!
But there now seems to be some clarification on this, which indicates you should have no more than 4 weeks absence each year! So, I think your 86 days absence may well prove a problem!