N2/NR trimmed at the "top of the green" makes a big difference. Never flown a UH-1 but have about 1500 in a 205A-1 and the Nr sounds a little slow or not trimmed up to max to me.
Must have been wind direction and attempt to HOGE as it pulls off a 540 and then happily flies away in the opposite direction from IGE?
Doesn't sound like the N1 topped as no NR decay. Life gets even more interesting when you are close to TR control limits and N1 tops!!
Up and under approach is sometimes better - set max power first, approach climbing up the hill facing straight at it, as the speed decays you can judge easily if you will have HOGE and if not just let the thing turn around and go back where you came from!