Congrats on your weight loss! Just some food for thought...climbing (and increased speed actually) is also quite skill based, so even if you have the power and less weight to pull up hill, you might want to work on things like carrying momentum into a hill and pacing your efforts during climbs. When you're riding with others, are you hiding in the pack as much as possible to save energy and utilize the draft? Are you targeting your weaknesses, pushing yourself on the bike, doing intervals, etc. or just riding?