I have been using a very similar technique and have found that smoke with red fleck colored tubes also work well. I think the key is to find the fish, and if they are active, color is not too important.
The Gobi's are bad? If the smallmouth in Ontario follow their brothers in Erie, those Gobi's are like gumdrops for the smallmouth. A NUTRITIONAL BONELESS DELICACY. That the smallmouth are ravishing. Evidence of the gobi's on the smallmouth population can be seen in weigh- ins on Lake Erie at both the Make a Wish tournament in May and the recent Elite series tournament for BASS(ESPN). MAW is a two fish tournament that normally exceed twelve pounds to win. In the elite tournament it took an AVERAGE of 4.5 lbs to win. That was a limit of five smallies daily over three days. The zebra mussels and gobi's have contributed to an outstanding smallmouth fishery. Are they a nuisance? of course, could they have a detrimental effect in the future or on other species of fish? of course. But the sight feeding smallmouth love them gobi's.
Fished out of port bay sunday afternoon, watermellon tubes only managed two smallies and more gobies than you could shake a stick at, anyone else noticing a large number of gobies in the lake this summer?