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I've been into archery for 58 years and have seen the problem you describe many times, it is not as uncommon as you may think. I've explained what the most likely causes are and how they should be addressed. The idler wheel lean would have to be reset, the rest timing reset, the nock height and centershot reset, etc. so you are really starting from scratch unless you've recorded these settings when the bow was shooting good. I've explained that your arrow selection is poor and why (the Chart is clearly labeled as a Gold Tip Chart), and if you enter the GT Chart using GT' guidance (go one box to the right), even for a 28" shaft 70# bow the recommend spine is still #5 .300". Finally, I've explained what needs to be done to get the .400 spine shafts to work, if they will work at all with FP and BH having same POI. As for some unnamed Mathews Tech or Regional Sales Rep saying you can't get .400 spine shafts with FP and BH to have the same POI, I really don't care ... I can get them to shot to the same spot (see my post "
Setting Up for Broadheads
"), but tuning is very critical and the arrows are very unforgiving of any form inconsistencies. If you could do it before, then you shouldn't have any problems now, and you shouldn't be vexed by what someone else says.
Easton's guidance on arrow spine hasn't been updated in decades, and the spine causing right or left POI is for Archer's Paradox Fingershooters, and not applicable to release aid shooters. Here is a demo I did to show that even severely underspined arrows can be tuned to a bullet hole, although a bullet hole doesn't guarantee FPs and BH will have the same POI (not all bullet holes are equal, see my post "
Setting Up for Broadheads
The Arrow Mfgr Industry has defined a Hard or Single Cam in the range of 290 fps to 315 fps. Easton has not updated their charts for X-Hard Cam, like the HeliM. Carbon Express, Gold Tip, and several other arrow manufactures have updated their arrow selection for the X-Hard Cams/Speed Bow in the 315 - 350 fps IBO rating. This is GT's Guidance:
Carbon Express provides an Adjusted DW Worksheet for entering their arrow selection chart:
I would recommend using CX's Adjusted DW Worksheet and using the results when entering Easton's Arrow Selection or any other arrow manufacturer's chart that doesn't compensate for the faster, more efficient bows. Example: 70# HeliM shooting 28" or longer arrow with 100 gr screw in point has an adjusted DW of 79#.
When entering Easton's chart, the recommend shafts can be the .330-340 spine if a 28" (28.5") arrow and 78# DW is used, or it can be a .300 spine if a 29" (28.5") arrow and 79# DW is used. When on the borderline, it is better and easier to tune when slightly stiff than weak, especially with fixed blade broadheads.
I've asked several questions and received either vague or no answers, like idler lean was 'supposed to be taken out' isn't a real answer; what check did you do on your part to verify it was correct? So, I assume you aren't really interested in solving your problem and more interested in venting, which is OK if that is what you want ... and why I say
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