When the Mispah gets to be easy for you to penetrate, the Castor or the Hydro are the next 2 to plan on, in that order...the Castor is more like 118 at bottom I think, and the Hydro at 165 or so....but I do NOT think you should be playing with penetrating the hydro without Trimix... If you have to penetrate the hydro, I will loan you one of my tanks
As opposed to the Hydro Atlantic where penetration is mostly at 165+, now you are diving air because of depth and your stipulation of no trimix. Now you have cut your bottom time to 20 minutes to stay within your 30 minute deco limit and are diving air at 165ft. Not a good plan or pay off in my mind. Stay shallower and get the better bottom time and use of nitrox. Save the Hydro for mix.
I have nothing against deep air. I do it myself routinely. However I have to agree with Dan, Kim and the others on this. The difference here is the familiarity factor. For you and I, aliens to Florida, these wrecks are brand new dives with current dynamics we've never experienced and unforseen challenges in totally new settings. In Florida I've done the Hydro, the DeWitt Clinton (I met Kim on that dive), and the Spiegel Grove. I did the Hydro and the Clinton on mix. We did multiple deck penetrations. I did the Spiegel Grove on air. No penetrations on the Grove, not just because of the lack of mix, but also because I had an insta buddy with 12 dives of experience. I don't think it would have been prudent of me to penetrate the Hydro or the Clinton on air. I go deeper air on wall dives here in my local western Canada waters. But even though these waters are colder, darker, and usually have less visibility, I am very familiarized with the sites. I can practically navigate them blind (have done so in about 5 ft vis). I now where to expect current surges. And there are no physical overheads and less entaglement opportunities. Penetration on a wreck at 165' where I've never been before is another challenge. A clear head is a prudent choice for such challenge.
In addition to the Grove, I also want add a couple of names of wrecks I've looked into doing on my next trips to Florida: The Deep Freeze, The Ophelia Brian. I think the Freeze is at 130ft and the Ophelia is at 100ft. Both are in the Miami area, and I've seen both advertised as recreational dives on Miami dive shops.
All my dives in Florida have been with just a 2mm shorty, even when going to 160' for 30 mins in early January. However, people say I have a good tolerance to cold. And no, I'm not nickel rocketing dry suits away. I do have two and have carried one in trips like the time I intended to do some dives in the Boston area. I just feel there's so much more freedom when you wear less plastic over you.
Also, I, like you, am prone to motion sickness. I got very sick on my trip to the Grove. I did manage to maintain trim and depth while doing the 15' stop with my buddy and spewing out my guts timing each hurl to happen as I took the reg out of my mouth only to put it back in after the hurl and grab a gasp of air in preparation for the next cycle. I know you can spew through your reg, but I would rather not have it happen to my babies. Just make sure you take the proper dosage of motion sickness medication.