That 1 second delay feels like FOREVER sometimes. My SDL takes just shy of 1 second, and I swear it feels like 5 seconds sometimes, especially when I'm used to the SL and the Honda which shift immediately.

Raising the idle speed will correct the slow shift to some extent because the fluid pressure is slightly higher and the pump volume greater. Could explain why you didn't notice it before fixing the top end when the idle was still higher than normal.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]