The pancreatic system isn't sensitive to negative feed back like the hpta is.
Also were not talking cronically high insulin levels. Long actng used for BB perposes is released over 15h (lantus/levimere). Lantus being better as it has a higher affinity for IGF-1 receptor sites.
As for insulin resistance I don't think its going to happen if you're of a good bf% and have an active lifestyle. Combine that with a healthy diet.. minimal risk.
I mean how many avid gym goers do you hear developing type II diabetes?
Insulin increases PS and nutrient uptake, the food you eat is what makes you fat. Clean food + long acting insulin is excellent.
http://www.ukiron.net has alot of studies and truly excellent info! Check it out.