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I have seen SBD around 0.7 ratio as well. when Steem touched $8 SBD was $13 i dont know what will happen when steem goes below $1 but i have a feeling that we will approach 1:1 and SBD may not go much lower than $1. you can convert some now and keep some for later

I wanted to grab as more as I could but one thing I am not able to understand is despite that much low price of STEEM and SBD the market Ask price is barely coming down.

the price is lower at exchanges, it takes time to reflect the price in steem market because there is not enough liquid steem i guess. the conversion ratio is already coming down as you can see its now sbd = 1.23 per steem
my assumption is that if it goes below $1 then we should have a 1:1 market

Convert whichever is higher I think. If STEEM is higher than SBD, then convert to SBD to get more SBD and if SBD goes higher than STEEM convert it back to STEEM.