Here are a couple of things to try.
I have a Shind trimmer that won't start warm if I give it any gas (pulling on trigger). No choke please.
It could be that the fuel is leaking back down and you need to pump the bulb up again, but don't use choke.
I have Shindaiwa blower that wants to be choked hot or cold, so if the previous doesn't work, try this.
You can also have problem with the sparkplug having too large a gap when it heats up and expands. Does the new plug also have a problem after it gets hot?
2-Walker 20 HP GHS, 1-Walker 26 hp GHS, 1-Walker 23 hp GHS, 42 and 48 GHS decks, 42 mulch deck, 42 discharge deck, 3-Honda WB, 3 Shind Trimmers, Stihl BR600 blower, Shind 260 edger, Two Shind Multi-tool with artic. clippers and chainsaw, Redmax 8000 blower, Redmax 7001 blower, Shind 803 Blower, Spyker walk spreader, sprayer for Walker mower, 3-Stihl chainsaws.