I do all long climbs on the tops, with just the occasional switch to the hoods for variety.
On Sat. we climbed the Montezuma Grade; 12 miles of constant climb between 5 and 9% but mostly at 6 - 7%. It took an hour 45 for me (Anza Borrego campground to the Summit), so that much constant climbing (no flat bits or descents) means I'm 90% on the tops, and with my hands pretty close to the stem too.

Both these guys were on the tops too.
Rick / OCRR