You used to be a member of Labour and were a centrist so you might have an insight how that group will react.
Nope - I think you are overestimating the level of insight that a rank and file member has on policy approaches. More specifically the Corbyn crowd were a kind of strange, tiny self contained splinter group with barely a handful of MPs prior to 2015. Their views weren't in any way mainstream in the party and therefore hardly likely that a centrist member would know of them to any great extent.
And I didn't vote for him in the leadership election (I voted for all the other candidates in various order) and left because of his leadership. So unlikely that I'd be on his Christmas card list, let alone have him ring me up to confide in me on plans of his economic figures don't add up.
I'm not thinking about voting for the Tories I'am thinking about voting Labour. My wife and I almost every time have voted for the winning party in the last 30 years, although I voted LibDem in 2010/5, we are floating voters.
Still not sure, I'am sure Corbyn isn't going to raise the money he thinks from Corp Tax, leaves a question mark.
So you seem to be implying that you won't vote Tory. If that is the case I think you need to decide whether your key objective is to vote in a positive manner for another party or vote tactically to ensure that the Tory candidate has the least chance of getting in.
I've no idea where you live and therefore of the political dynamics and whether it is a safe seat (in which case whichever way you vote is unlikely to change anything) or a marginal (in which case it might).
I'll add another couple of comments.
First even with the poll surge I think it is exceptionally unlikely that we will see a Corbyn lead government after the 8th June, so the issue is moot.
Secondly even were we too, Corbyn's hands will be completely tied, because virtually the whole of parliament will be to the right of him politically. His only option in power will be to compromise to the centre and right of his own party, as otherwise his plans will simply get voted down. The likelihood of him gaining a majority is vanishingly small but even if he did there will be no majority of like minded people.