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I would recommend plate modulating or even using the second grid rather than using the first grid. That would reduce FMing and also give you much cleaner audio. You should only drive the tube at 1/4 of it's maximum output power, that way your modulation will swing your carrier both negative and positive with your audio which is the proper way to run AM.
If you run the tube to full power and then modulate it then there is nowhere the audio can push the carrier into the positive territory, thus resulting in only dropping carrier power with modulation peaks.
A brief brush up on AM transmitting basics will help you out on this.
Also beware of over-modulation as that will cause bad distortion.
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