The villain is a reg.
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fold, fold, fold, fold, Hero raises to 5 BB
If you plan to bet-fold, you must use different sizes...Or even check to show a weakness...Without an info, this is an easy 3bet OTT. All in...You said "he is a reg", again, if he is a reg, it is over with this size OTT, you can't fold...Only the HUD can give you the permission to fold here...IMO..And again, I mean because of the SPR, the size OTT...When you use such a monster size OTT, you should know already what to do vs raise. Too late for fold...
Big size usually means "polarized bet". And should be...That's why...Ok, you can do this for thin value vs calling station (linear range), but not vs someone else. I think OTT is a check or not so big bet. At this board...Only vs calling station will be a good idea to play like that. Even vs such a guy will be not clear fold (vs this size he can raise weaker hand for "protection"). You need info for fold even vs calling station, I mean.
About this 5x size. Actually it is easier for him to defend vs such a size. Imo you can use this size vs some calling station (for max value) or vs nit as bluff (some stupid hand)...If you want to try something different, you can use limp, with limp-fold, limp-raise and limp call. Depends on his size for raise vs limp...But the problem is you cant use the HUD effectively and this is kinda lost of value, this lack of info...You can try vs random players...This applies also for 5x or 7x or 25x or whatever "strategy"...