As a 15 as well I’m interested to hear what others say. I would probably have gone for it as well. 150 is not that far and if the lie was not that bad I would think I could do it with 8i or more with safety. I have been getting better with my 5 hybrid lately and that seems to cut through rough decently and can be an option as well if long is better.
Personally I don’t think you made a bad choice assuming you hit your 6i decently most of the time. Since things didn’t work out it’s easy to 2nd guess, but it still may have been the % play. As a 15 I’m guessing that your short game is not magical so laying up at 150 seems too conservative. I could see if it was 175 or more, but I’m thinking of my game and I’d still want to see the lie and take in all the other variables.
I had a similar shot yesterday with 7i and didn’t pull it off, but I should have aimed more right to allow for safety and for the rough closing the face down. I had another almost identical shot on the back 9 and this time pulled it off because I did a better job with figuring out the miss and alignment.