Collateral vessel development can be inhibited by diabetes, hypertension an athrosclerosis. With good collateral flow, there shouldn't be any cause for concern...but collaterals can develop stenosis as well so it is not a cure for the RCA blood flow.
"However, I smoked cigarettes for a long time, and I do believe those pimp sticks affect the ability to develop the blessed collaterals"
Well, I smoked 30 a day for 20 years and developed Collaterals. Maybe another way to see it is that the reduced Oxygen level caused by cigarettes along with the occlusions building up in my Coronary Arteries, acccelerated collateral growth. Who knows.
It sounds like you are doing great, given a 100% RCA blockage. Some people can develop colaterals, and others can't, I'm told. I'd keep up the drug regimen, and mix in some salads in your diet to get your ldl colesterol below 75 and your hdl above 50. The fact that you can walk uphill with low BP is incredible. You are obviously exercising, and it sounds like the meds plus exercise are serving you well.
For whatever reason I have poor luck developing collaterals, even after taking the good drugs, exercising daily for ten years, losing a lot of weight. However, I smoked cigarettes for a long time, and I do believe those pimp sticks affect the ability to develop the blessed collaterals. I've had to have five stents inserted in the RCA and three in the LCA.
I'd keep doing what is working. Keep us informed.