Were you quite active prior to the bypass surgery? Trigs are lowered and HDLs are increased with physical activity, and you were inactive during your surgical down time, I'm wondering if that would account for the difference. I'm betting your wine and martini consumption was the same before and after the procedure, so doubt that is a factor in the change. Martinis are highly glycemic, wine much less so, perhaps substituting libations might be interesting to see what happens.
My HDL went up and my Trig level went down when I started taking 1000mg of good quality fish oil twice a day several years ago, you might mix fish oil into your drug regimen and see what happens. I take fish oil produced from sardines and anchovies, as these fish are never farmed. Fish oil from farmed salmon lacks the benefit of wild fish.
I'm betting you will do great with the 5K run. I'm your age, and hoped to run one in June as part of The Race for the Cure cancer benefit with my children and grandchildren, but think I'll have to walk it.
Sounds like you are recovering well. Keep us informed.
What your are describing is Metabolic Syndrome. It is characterized by high TGL's and low HDL and is usually due to insulin resistance. Insulin is produced by the pancreas in normal amounts in response to carbohydrate intake and helps to get the glucose into the cells to be used by your body as energy. If you consume too many refined carbohydrates, they are metabolized too quickly, and the increased insulin production will lead to too much insulin in the bloodstream and the cells then fail to respond and become insulin resistant. Alcohol also metabolizes as sugar just like other empty carbs and will make the condition worse.
I would ask your doctor to test you for insulin resistance, your numbers fit the profile. In this case, the low HDL is a symptom of an underlying condition.
Just my thoughts, good luck,