Scotty, if you don't mind my unsolicited advice... please talk to your doc (seriously). Anything that will lead to water retention (most good AAS) will equate to high BP.
However, it has always been a moniker of mine to "enjoy in moderation".
That said (since I don't know your stats) Oxandrolone is considered by many to be the "safest" steroid around, even considered by those who have high bp like yourself. This may however be to mild a substance for your needs. Either way, talk to someone who knows... a physician. It's not worth screwing with your ticker bro