I used to use a Tuna Melt, but replaced it with the Cool Cat Tremolo (same basic opto circuit I believe, but true bypass, and much more positive footswitch operation). I have never noticed the problem you mention, but (1) I always use quite a fast rate, and (2) I rarely if ever use drive at the same time (but if I did, the drives are all before the trem).
If you are using a slower trem rate, then occasionally the attack of your note will coincide with the 'trough' of the trem, and you will get a slow-attack thing going on. I guess this will be more noticeable if you are expecting your sound to cut through because you have stomped on the drive pedal.
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‘There is no excellent beauty that hath not some strangeness in the proportion.' - Francis Bacon
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