I just came from the Isky web site, after looking at his cam lobe specs pages for flat tappet lobes.
Of course, almost all these lobes are designed for rocker arm engines, so the raw lobe lift is on the short side for the particular duration.
What I did come to realize is that the stock Triumph cams have a seriously fast lift rate compared to even custom lobes from a specialty grinder. That's how Triumph can make the HP is does with seemingly short duration cams. The only downside to fast lift rate lobes is possible cam and valve train wear. Putting a large amount of oil up top is the countering measure. Not only does the extra oil keep things lubed better, but it takes the heat away, down to the crankcase for dissipation.
Coming up with a a new - and better - grind could be a little tricky. As Red Green would say, "This is best left for professionals."
