Motor is hard to start after warm up

I live in Michigan and just this last weekend I went down 1 jet size on my Holley hp 750 seconardys cause it felt not as crisp as before and yeah the motor is back like it was. Thats funny cause 2 months ago I need to jet the primary side up 2 from 71's to 73 cause it felt a litte lean part throttle. Motor is running now just great--wish the snow and salt would never come-I even drove it today when it was 28 degress outside, I floor it 2 times and it starts right up, rev. it for 10-15 sec. and drive off, it has no choke-its a hp carb. The rest of the day it starts just fine, if its off for over an hour I just need to floor it half way once then crank. I think its in your carb. and or spark box. 2 winters ago when I had the MSD 6 box it start ok but stall once or twice but now with the MSD 7al and 8251 coil its almost like a new car--well expect for the 14" of vacuum at idle but its a good strong idle and never stalls out. I never had an Eddy carb so not sure whats wrong. If got got the $$ though I would get the Holley HP carb and a MSD 7al box but yeah that stuff is not cheap. I got my Holley then 5 years latter I upgraded my spark box. I am so glad I did looking back. Good luck