superflyer99,

I think you have miscalculated. HHonors to Delta is as follows:
http://hhonors1.hilton.com/en_US/hh/...ntsformiles.do

Conversion rates for all other partners: Exchange HHonors Points for Airline Miles HHonors Points for Airline Miles
10,000 HHonors points = 1,000 miles
Exchange in increments of 10,000 points

So with the Delta 150% Boost you will get only 12,500 Skymiles.