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It sounds like a fueling problem to me. If you have to leave the choke on to have it idle, that usually means it is not getting the required fuel for the air it is bringing in. When it is cold, this is normal, but after warm-up still needing the choke is evidence of inadequate fuel supply. The stalling or bogging when you try to open the throttle is also evidence of this. When you open the throttle, the engine vacuum should pull fuel into the engine from the carb. If there is gunk or bad gas, you are not matching the fuel supply to the air it is inhaling. I know the bike has a lean tendency stock, and that is why the needle shim trick works. Check your shutoff valve and fuel filter (if equipped). Hope this helps.
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