The Brit has found form in recent weeks to overturn Sebastian Vettel’s lead atop the F1 Drivers’ Championship standings.
Hamilton is now 17 points clear of his fellow four-time world champion having been in a worrying position after three races with Ferrari appearing the quicker team.
The defending champion has helped allay those fears slightly in the last two races, with Mercedes only denied back-to-back one-two finishes by a cruel tyre blow-out for Valtteri Bottas late on at the Azerbaijan Grand Prix.
Mercedes still face huge competition from Ferrari, who had a quicker package in Bahrain, China and Azerbaijan but lacked speed compared to their Brackley-based rivals in the opening race in Australia and also last time out in Spain.
Hamilton was dominant in Barcelona, winning by over 20 seconds, although Vettel is not gone from his rear-view mirrors just yet.
And as the Silver Arrows look to reassert themselves as the undisputed top team within the sport having won four drivers and team titles in a row, Hamilton insists the Spanish Grand Prix and the subsequent work – including at in-season testing – represents clear progress.
“I feel with the last race, the whole weekend, I think we took a lot of information from there,” he said ahead of Monaco this weekend.
“The whole first five races I think, we’ve learnt a huge amount, we know what our targets are, we much more understand our issues.
“We’re working hard to address them. I think we’re working in the right direction towards addressing them.
“I definitely feel more confident moving forward that we are progressing in the right direction. Have we rectified everything? We’ll find out.
“It just feels good, that there’s a lot of work been going on: a lot of stress, a lot of strain within everyone’s work. Everyone’s just trying to do their best and get us up front.
“Obviously our competition has been very, very strong through the first five races but it is up and down from race to race.
“But I do think the first five races are always very difficult because it’s just a learning curve. A very steep learning curve every year, even though we have that winter test.
“I can’t tell you what’s going to happen moving forwards but I’m confident that we’re going to do the best job that we can to maximise our results.”
FP1 (10am) and FP2 (2pm) of the Monaco Grand Prix get underway today followed by a day off tomorrow and then FP3 and qualifying on Saturday.