Not exactly, because Va decreases with alt (I mean in Fw chart). But near sealevel D9 would no reach its max. substained climb rate at 170mph, but at 180 mph. Max climb rate would remain the same.
Your screenshot shows what seems about 3900 fpm at 5k starting with 100% fuel. For that height, Fw chart shows 20.5 m/s (4035 fpm) with MW50 (2100 PS at 1500m). So, you are basically right in your post.
That chart also shows Va = 280 Km/h (173 mph) for 1500m MW50.
Minimum Va is listed for about 30k, 235 Km/h (146 mph).