I brewed an ESB two days ago, and the gravity was significantly lower than I expected (1.052 vs. 1.060). Given the IBUs were on the high side of style (50), I was worried that the beer would turn out too bitter. It dawned on my today that I could increase the gravity without adding IBUs by boiling some DME in a small volume of water to achieve a gravity around 1.100. After cooling, I'd add this to the fermenter, now at the peak of primary fermentation, and boost the gravity closer to target. I know this is a method used to brew big beers, but would any of you recommend this for my case? I plan on doing this tonight, so any recommendations or advice would be appreciated.