You will definitely feel shitty after you stop taking suboxone. If you are having success tapering with the oxy, I would keep doing that as long as you feel you are not going to cheat. Because oxy is faster acting, the WD symptoms will not last as long as suboxone will. However, with either, if you can correctly taper slow and steady, you can minimize WD to almost nothing. I've never had the self control to do that with full agonist opiates (oxy or heroin) but if you do have that self control, there's no reason to switch to suboxone unless it makes sense financially. Suboxone, in my case, has always been way cheaper on the street than Oxycodone. I know we're not allowed to post pricing, so I hope this isn't breaking the rules, but what I pay for 8mg of suboxone would get me the equivalent of 10-15mg of oxycodone. And 8mg of suboxone will keep you well waaaaay longer than than 10mg of Oxycodone would. If weening down on OC isn't breaking your bank, and your self control is good enough not to wake up one day and decide you wanna take 150mg of OC to get high "one last time", then just keep doing what your doing. I would wager for nearly all opiate addicts, this usually ends unsuccessfully, but I know an addict whose self control was the most ridiculous thing I've ever seen. So it's not impossible to ween off OC completely. It's just very hard for most because as long as you still have OC in your possession, the addict inside is usually screaming "take some! Take some!" however with your OC tolerance right now, it would be possible, and very likely you would get high on the suboxone too if you took to much. I knew plenty of addicts back in my early days of using before everyone switched from OC to heroin and there were OC addicts that would buy suboxone, not to get off OC, but to get high off it when they were broke. When your tolerance isn't through the roof, which imo yours isn't, you could just as easily fuck up with suboxone and end up taking more than you need because it can get you high if you take too much.
If you decided to switch to suboxone right now to complete your weening process and wanted to do a quick taper with it, I would start with 2mg and work your way down from there by .5mg a day the first few days (so 2mg day one, 1.5mg day two, 1mg day 3, .5mg day 4) and once you get down to .5mg take that day 5 as well, and then .25mg day 6 and 7, and after that don't take anything on day 8. See how you feel. Because of the super long half life of suboxone you'll still have a little suboxone in your system from the 2mg you took on day 1. So after a week I would not take anything on day 8, then take another .25mg on day 9, nothing day 10, .25mg on day 11. If you feel stabile at this point, start skipping two days between taking .25mg, or just stop altogether if you can.
That's just me, I'm sure there's people who have more personal experience with bupe than I do. I've done a taper with suboxone once and I was able to go from a gram of heroin a day, to 8mg suboxone a day, to .25mg suboxone a day within two months and it was completely painless. I was also VERY highly motivated at the time, more so than I ever have been in my life, including right now, and I think that motivation to leave my shitty past behind and looking to my brighter future helped a lot.
Getting off opiates is so much easier when you have something to live for and better your life for. In my case it was a financial opportunity that I ultimately fucked up because I relapsed.
Anyways, keep doing what you're doing if it's working for you. If you feel like you need to switch to suboxone because you don't trust yourself having Oxycodone around or you need to for financial reasons, I'm sure someone else can give you a more detailed and thorough plan of action