How on earth do you quote his ranking in early 06 when all of it was from his 05 season? He was in poor form in early 06, lost to Chela at the AO and ancient Henman whom he had owned previously at Miami. Form-wise, pretty far from a top 10 player. And regardless Berdych finished 06 ranked 6 spots higher than Hewitt which is more indicative than a ranking which is mostly based off 05. Hewitt's form improved a bit from the FO onwards in 06 but in the early parts of the year it was pretty poor.
Similarly Hewitt and Tsonga finished 07 ranked 21 and 43...both really far from a peak level although again the trajectory of their rankings is telling, Hewitt was falling, Tsonga was rising. Given that, two tiebreak sets in a grass court warmup don't really mean anything...
Let's start with Hewitt in 2007. Yes, he had a slow start at the Australian Open, losing to Chela in the 2nd round. But then, as I noted, he made consecutive finals in San Jose and Las Vegas and beat Schuettler, who always gave him problems, just before losing to Berdych. Then, yes, he did get upset by Henman, but he then had some very solid results on clay and won Queen's Club, which actually rose his ranking to #9 for Wimbledon, where he made the QF. It wasn't until the 2nd half of the year that his ranking dropped. His results from San Jose to Wimbledon were pretty solid.
As for Berdych, he was 6-6 coming into the match against Hewitt at Indian Wells, and, as I noted, got crushed in his next match against Baghdatis. Indeed, Berdych was 6-6 in the 12 matches before he played Hewitt and 6-6 in the 12 matches after he played Hewitt. Again, as you noted, he then played well for the rest of the year to raise his ranking, but he was no great shakes at the time of his match against Hewitt.
Next, let's look at Hewitt in 2007. He was #16 entering the match against Tsonga, and, despite losing that match and all of the points from his 2006 win at Queen's Club, he was still #16 entering the U.S. Open, losing to Djokovic at Wimbledon and Federer at Canada and Cincinnati. Again, as in 2006, his results tailed off toward the end of the year, but he was playing pretty well in the middle of the year.
As for Tsonga, I don't think there's any doubt that his star was on the rise in 2007, but still, the win over Hewitt was the only top 50 win he had in 2007 until Metz in October.