Both of your combos are good in my opinion, although 230cc heads are overkill. I've used the same Lunati roller installed @102, they pull hard to 7800 with less spring so I don't relate the issue with a spring problem.
You mentioned a Transmission Speciality converter. If it's spragless, that is what I'd look at first. Nothing I've built has pulled hard on top with that style of converter. Truthfully I don't care for spragless in any application I've found.
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