First off, if you are really
casting 80ft (and do see this thread: https://www.speypages.com/speyclave/...e-casting.html
) with a short head on a 4wt, that's actually pretty good, should be sufficient for most trout-class fishing. So is the issue primarily consistency at those distances ?
If you are talking about the 305gr, 23', plain "Trout Spey" head from Rio
, I am also wondering if you should adjust equipment. If I recall correctly, that head is more of a super short scandi taper, might get better results with trout-weight polyleader or tapered mono straight to the head. If you want to throw tips, get a true skagit. If you wonder if this is a problem, forget about distance and shooting line, get on still water, not too deep, do some roll casts. If the line + leader unrolls smoothly and easily with minimal effort -- and with that short a head, I really mean minimal effort -- you are OK. If you see the leader stalling in turnover and/or you feel the urge to goose the cast to get turnover, maybe there is an issue.
In terms of loops : pretty much any casting problem is going to manifest itself in some sort of loop problem. For useful feedback, you need to narrow it down a bit.
Good turnover happens when you have no slack in your rig, you have a proper anchor, and you accelerate the rod smoothly in a straight line. If the cast flies straight and doesn't turn over consistently, could be many things : blown anchor, running line released too early, distance too far for caster skill, trunking/too much anchor, slack in D-loop, thrusting, the possibilities are nearly endless. If the problem is the loop is not straight, but some unwanted side to side motion, that's a little narrower scope, there are two likely causes, both already mentioned. First possibility: your anchor is not straight in line with the forward cast. Easy way to diagnose this. Go to still water, stop the cast just before the forward stroke, look at your anchor. Repeat ten or twenty times. Second : your rod tip path is not straight on the forward stroke, for example moving inward across your body due to body/shoulder rotation on the forward cast. See if you can find a friend with a phone, or, a tripod, and video yourself from the back. It will be obvious if this is a problem. While you're at if you can freeze frame and look at what your anchor is doing.