My cooker can't handle a full boil either so I messed about with brewers friend and made a 3 gallon partial mash (first time ever) gave me around 2g @ 1.055 wort then added 1.5 LME to the fermentor topped up to 5g with water, total OG was 1.050 which I'm pretty happy about.
Seemed like the best...
I finished my first ever brew Chinook IPA too, looked exactly the same as yours and same fg, tastes awesome btw. I definitely have the bug now though as I spent this weekend brewing a Weissbeir :)